Swap tanks or taunt at X stacks, when Y happens, or before Z occurs is a staple raiding model design, I think. You need to put in a mechanic that requires you to switch tanks, or there would be no need to bring more than one tank into a raid. And with only one tank in a full raid group, you run into a bit of a gearing problem--that's an entire slew of gear that would go to too few people (sort of like how we have for Holy Paladins).

Besides, the main "job" of tanking isn't just aggro, it's a combination of mitigating as much damage as possible (thereby saving healer stress and mana) and protecting the rest of the group (ensuring that they can live to kill the boss, something that you yourself cannot hope to do alone).

If all a tank had to do was mitigate incoming damage, I'd imagine (at least in the current tanking model) that tanking would be very boring. As we progress into Mists, and we see mitigation become a more active model, I foresee such decisions of making threat less of a staple of a tank's job to be more enjoyable for tanks. Time will tell, however. But, in the meantime, without the active mitigation model (outside of using things like raid wall cooldowns) I would agree that it feels somewhat incomplete, though I have good hopes for Mists in this regard.

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