Please read before you start posting nonsense like "300% IS BETTER ARE YOU DUMB???". Also get ready for math class.
Cinco I seen a screenshot of you saying the arc vests are stacking damage in a discord server I am banned from though I have never joined there. I don't think I've seen everything that was said, but I will go into detail as to why stacking is terrible for vests.

Stacking damage is best when it is mixed with nonstacking damage. If you have stacking damage mixed with nonstacking damage then they multiply, if you have stacking damage with stacking damage then they add, if you have nonstacking damage with nonstacking damage then which ever number is the most will be applied.

Here is the math part. I am a mage for example- I have a base damage stat of 7,000. I also have an aquaris staff (700% stacking damage) and I have either an ebon or abyssal vest (200% nonstack). If I proc those at the same time then it will be 7,000 x 7 to get 49,000 via stacking damage + 7,000 base which makes it 56,000 damage, I also have my abyssal / ebon vest proced which gives me 200% nonstacking damage. 56,000 times 2 is 112,000 damage. I get 112,000 damage from 200% nonstacking and 700% stacking.
(7000*7+7,000)(2)

Now, lets try stacking with stacking.

I have a mage with 7,000 damage. I also have an aquaris staff (700% stack) I also have an imaginary arcane chestplate (700% stacking). 7 times 7,000 gives me 49,000 damage + your 7,000 base for a total of 56,000 damage. Again 7,000 times 7 + your base gives me 56,000 damage. 56,000 + 56,000 = 112,000 damage with a total of 1,400% stacking damage.
(7,000*7+7000)+(7,000*7+7000)

Our weapons have stacking damage which means our vests have to have nonstacking damage in order for them to work together more efficiently. Stacking damage multiplies the base number by the percent and adds the final value to the base number while nonstacking just multiplies the base number by said percent which is why they work so amazingly together.
Make all 3 classes vest nonstack. Dozer axe, Dozer aegis, skratch staff, dugg dags, pisces, aquaris, and what ever other weapon buffs damage is stacking damage. Now you understand why we want nonstacking vests.