I mean, sure, you can spam taunt if you really think that miniscule amount of hate means something, and you think emergencies are unlikely.
If, however, there is an enchanter with a charm, and it's liable to break, it is utterly invaluable for the tank to at least try to taunt it first before committing to aggro spells. That is one such example of why you should keep taunt up whenever you can.
Isn't this obvious? There are also plenty more scenarios where it would come in handy, so keeping it off cooldown, in a dungeon where you're tanking for a group, is the wiser course of action.
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