This argument is very circumstantial to massive AE pulls. If you are a WAR spamming the crap out of over-power on a 4 or 5 mob pull, you are doing it to DPS not to hold enmity.

The best way to solve this is for people to ask for it when they need it, as its not on a 30 sec CD or anything. A really good NIN will be able to do this instinctively, but there are a lot of variables. When I tank on WAR or PLD I manage my resources carefully to be efficient, trading Flashes/Riot Blades or Overpowers/Flashes. If a NIN Goaded me when I had 8 mobs and had my resources totally under control, and the MNK, DRG, or BRD runs out of steam because they can't AE anymore, its going to make the fight longer, make me take more dmg, etc.

Now if I am in a dungeon with a NIN and a BLM who is just raining flares and better geared then me, then yeah I want that TP to make my life easier. MNK and DRG AE certainly isn't "good," but if you have the right CDs up it can be very effective, but it is a HUGE TP drain. So if I'm on WAR and I can OP/Flash/OP/Flash/OP/Infur/SC and hold enmity just fine, Goad the MNK.