Maybe they should make parry double dip its effect. Have it work like crit does now - the parry rating affects your chance to parry AND BLOCK at the rate it currently does, and also have a minor impact on the strength of block and parry.

It would be nice to think that if I decided to stack parry on my gear for whatever weird reason (maybe if the meta changes so tank DPS isnt so important) that having 400 parry on gear would not only give me 8-9% more parry chance, but also 8-9% more block chance and bump my parry from 20% to 24% and my block from 29% to 34% or something. Something fairly concrete so you actually notice a difference.

That said, whilst I wont disagree that I wish shields were stronger, I think we can all agree that paladin mitigation isnt exactly bad, and if paladins are in need of buffs then buffing their RNG-based physical mitigation even more isnt the best place to target them!