Originally the idea behind the no proc testwas to see if it would have an impact on the performance of the server. The first test only gave access to a total of 18 sets. Later in U31 they expanded the list, which is pretty much the list you can see above right now.
Below you can find the original text from the PVP & Combat Lead Brian Wheeler dated February 8th 2021.
Last year, we ran a series of tests on the Live PC megaservers in an effort to identify potential solutions for the ongoing performance issues in Cyrodiil (you can read the full details surrounding the reasons behind these tests inthis forum post). Our previous rounds of testing in Cyrodiil last year concluded with some interesting data that pointed us towards various avenues to explore for both future tests and long term solutions. However, those tests did not provide a definitive “This will fix all the things” solutions. We did find that slowing down calculations on the server per combat action does indeed help with performance, but again, not to an appreciable amount where it could be a permanent solution; more tests are necessary to follow various branches of thought regarding server performance and combat calculations. As such, we will be performing at least 1 more test where we are affecting how much information is processed per combat action by limiting item set procs in Cyrodiil.
On February 15th, we will be disabling Item Set bonuses outside of pure stat gains. This means any item set which has a proc, or condition which is driven by an ability, will have that ability disabled. This includes Item Sets like Seducer, as that set reduces Magicka cost abilities by 10%. That reduction of cost is done via an ability, which has to check anytime you cast an ability if it’s cost should be reduced. Other sets, such as Hunding’s Rage, is completely unaffected by this change as it simply grants stats without requirements.
The full list of Sets which arenotaffected by this test are as follows:
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Amber Plasm
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Armor of the Trainee
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Beekeeper’s Gear
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Crafty Alfiq
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Draugr Hulk
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Endurance
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Fortified Brass
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Grace of the Ancients
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Hunding’s Rage
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Impregnable Armor
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Law of Julianos
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Leviathan
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Mother’s Sorrow
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Plague Doctor
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Shacklebreaker
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Spinner’s Garments
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Spriggan’s Thorns
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Willpower Agility
At this time, we are planning for this test to run for at least 3 weeks, and will let everyone know when we have next steps locked in.
When this test begins on February 15, we will also be reverting a prior test where abilities cast on allies were restricted to group targets only. This adjustment gave no appreciable gains towards performance improvements, so this restriction will be removed until further notice and abilities which target/can be triggered by players outside of your group will once again function as they do outside of Cyrodiil.
We look forward to your feedback and seeing the effects of this test!"
In the Update 31 Patch Notes they expanded the list and explained that now all the No-Champion Point servers will have this ruleset included.
For Update 31, the existing No-CP Cyrodiil and Imperial City campaigns will now also prohibit proc sets from firing. We have expanded the number of sets from the original grouping that worked during the initial test several months ago.
As a refresher, the following sets were not affected by this ruleset when it was originally implemented back in February:
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Amber Plasm
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Armor of the Trainee
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Beekeeper’s Gear
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Crafty Alfiq
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Draugr Hulk
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Endurance
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Fortified Brass
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Grace of the Ancients
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Hunding’s Rage
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Impregnable Armor
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Law of Julianos
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Leviathan
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Mother’s Sorrow
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Plague Doctor
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Shacklebreaker
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Spinner’s Garments
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Spriggan’s Thorns
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Willpower Agility
The following sets will also now function with these campaign rules:
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Aetherial Ascension
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Akaviri Dragonguard
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Agility
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Amber Plasm
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Archer's Mind
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Armor of the Seducer
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Armor of the Trainee
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Assassin's Guile
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Bahraha's Curse (aka Bahara) (4-pieces)
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Bastion of the Heartland
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Battlefield Acrobat
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Beekeeper’s Gear
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Black Rose
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Blessing of the Potentates
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Blooddrinker
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Buffer of the Swift
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Caustic Arrow (Master)
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Crafty Alfiq
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Crushing Wall (Maelstrom)
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Dagon's Dominion
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Darkstride
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Deadly Strike
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Draugr Hulk
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Duneripper's Scales
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Eagle Eye
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Elf Bane
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Endurance
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Eyes of Mara
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Flanking Strategist
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Fortified Brass
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Frostbite
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Grace of the Ancients
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Hawk's Eve
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Hunding’s Rage
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Impregnable Armor
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Innate Axiom
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Jorvuld's Guidance
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Kvatch Gladiator
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Law of Julianos
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Leki's Focus
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Leviathan
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Light Speaker
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Mark of the Pariah
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Marksman's Crest
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Mother’s Sorrow
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Netch's Touch
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Night Mother's Embrace
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Night Terror (3-piece)
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Orgnum's Scales
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Perfected Caustic Arrow
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Perfected Crushing Wall
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Permafrost
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Plague Doctor
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Ranger's Gait
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Red Eagle's Fury
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Relics of the Physician, Ansur
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Robes of Alteration Mastery
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Robes of Destruction Mastery
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Salvation
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Sergeant's Mail
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Shacklebreaker
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Shapeshifter's Chain
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Shield Breaker
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Shield of the Valiant (5-piece)
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Silks of the Sun
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Spider Cultist Cowl
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Spinner’s Garments
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Spriggan’s Thorns
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Strength of the Automaton
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Swamp Raider
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Sword Dancer
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Sword-Singer
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Syvarra's Scales (4-pieces)
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Torug's Pact
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Trial by Fire
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Twilight's Embrace
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Vesture of Darloc Brae (4-piece)
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War Maiden
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Way of Air (4-piece)
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Way of the Arena
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Willow's Path
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Willpower
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Witch-Knight's Defiance
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Wrath of the Imperium
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Ysgramor's Birthright
Additionally, Volendrung has been disabled in the No-CP, No-Proc Campaign.