Honestly, re-evaluating PLD's abilities it's actually quite a mitigation beast... at least on paper. Blind, Pacification, Stun, and Silence perhaps the strongest combination of mitigation enfeeblements in the game, but these effects don't work on anything in relevant content, even trash mobs have almost uniformly become immune to most of these effects in post 50 raids. Suppose if they did work though, think about the level of complexity it could add to PLD timing critical enfeeblements, not to mention the party mitigation benefits it could offer.

I mean most jobs get their own unique unresistable enfeeblements, I don't see why PLD's shouldn't at least work part of the time.