Is so obvious, provoke give small amount of time for PLD to recover hate, by time you have no retard dps, it work good, but since DPS only care about they number, most of the time they careless about aggro snap giving no chance to PLD, even with provoke.
The first argument would be: You shouldn't have lose hate in first place. and that point easy how useless provoke is in that situation. At best, it give a warning to DPS to slow down, and PLD can recover.
Provoke in this game only gr8 to transfer hate with OT tank, or to pull the bugged Spiny plume.