If you run Dragonsong Ultimate or some other more difficult endgame contents, Paladin will run out of cooldowns while every other tank will be able to stack multiple due to PLD having 2-3 fewer defensive cooldowns than the other tank jobs.

WAR has a similar issues in that Thrill is relatively weak, but still nowhere near as problematic as Paladin that just doesn't have one to cycle and because Holmgang has such a short cooldown they are able to cycle that in much more freely than Hallowed to compensate.