The reason it's more of a struggle to play PLD/DRK in current content than WAR is because mitigation in the current raid is such a joke that you can wear near full STR and run DPS stance 99% of the time while 1-2 healers DPS. PLD/DRK have access to their full kit and nothing really changes for them in this meta, whereas WAR rarely if ever needs to IB or stay in Defiance for more than a few GCDs to run out Unchained. IB is great, but in the current meta it's only use is when Unchained is up if IB is even necessary (so early progression and some points in A3S/A4S still).