The problem is the weak damage for certain sets, which procs were never ever meant to solve.
The players decided that that is how we would solve that issue, by procing out (where possible) the damage weak ATs so that soloing wasn't as slow and painful as molsasses.
The idea that certain ATs should be faster while teaming, yet Brutes, Tanks etc have mez prot, defensive shields and can zoom through most content with adequate damage is seemingly an archaic one for a lot of players --- hence my first two sentences.
If procs are going to be changed in a way (devs have said some will be better, some will be worse and some won't change much) then that really does need to be coupled with a review of the damage potential of some pri/secondary sets and some ATs.