Playstyles can vary incredibly between players, that includes tanks in dungeons. The way I play WAR in heroic/expert dungeons, I could be conservative on my TP that I wouldn't run out until the 6th pull, or go nuts with a large pull and spam overpower + damage buffs and bloodbath.

As for TP consumption, ninja has such low TP costs on their rotation that they'd never run into any problems, even with an increased attack speed. Every other class would unfortunately run out of TP doing their optimal damage skills if the fight gets incredibly prolonged without any pauses (T8 for example). Because of that, Goad is not necessarily inferior to paeon, (esp for my party makeup of NIN/MNK/BRD/BLM) unless you have 2 non-ninja/caster dps (in which case, you;re running a triple melee for this scenaro...)