The main reason I can think of as to why THF got these abilityies, is because THF has always been great at evading attacks, yet we were never able to get to the top of the hate list, unless we had Mandau.
We even get a great 2 hour for saving the party a bit of time for people to get out of AOE range, Mages to recover a couple of ticks of MP, debuffs to wear or whatever, but before these JAs, we had to wait for the rest of the party/alliance to wipe before we were top of the hate list, and Perfect Dodge became useful for solo only.

Without vast changes to the enmity system, what PLD could use is not so much an ability that steals enmity from other players, but an ability that cuts the accumulated enmity of players in AOE range by half, allowing PLD to remain at enmity cap while other DDs rebuild hate. Let them use this ability every 60 secs, and PLD should be tanking for most of the fight.