Should one tank in tank stance?

[Seraphor]

I'll just add to this that enmity controls have moderately long cooldowns. Unless the party is willing to stop and wait between pulls, they might not always be available. I tend to not use enmity reduction on mobs outside of the first pull because I'd rather not rip the boss off the tank. Everyone has to watch aggro, but I think the tank bears a little more responsibility outside of boss fights.

The tank should have no issues holding enmity in a boss fight. So long as they start in tank stance and use a few enmity combos, with the odd top up, there should be no trouble whatsoever. There's nothing wrong with a tank doing this in most dungeons, their damage isn't a crucial factor like endgame raids.

Pulling mob packs however is quick, and depending on enemy placement you don't always have enough time to use all your enmity skills before they disperse and then you're playing a game of cat and mouse chasing them around. That's when you want your DPS to use their enmity cooldowns.