Proc damage sets are a good example of the problem of using one set of rules for two disparate game modes. Proc damage is balanced to be competitive at a DPS level in PVE (especially for less experienced players) which makes it OP at a burst level in PVP.
I would prefer PVP if it was limited to crafted armor and Cyrodiil/IC sets; perhaps with some pruning. This would also alleviate the gear grind for PVP players.
Proc sets were a thing back when Viper's Sting was made available, and Proc damage could still Crit.