Tanks Not Using Emnity Skill.In Dungeons

[Mhaeric]

Keeping it on as the off tank is okay to do, assuming you go a few rounds without it to let the main tank build up a buffer so you don't accidentally pull hate when you don't want it. Keeping it on like this makes it marginally easier to pick up hate if the main tank happens to die, since it will likely automatically turn to you. That said, it's not necessary by any means since it takes at most a single GCD to get hate if that happens when you haven't been using it. There is some content that requires both tanks be at the top of whatever enmity lists there are, but most don't.

tl;dr - use tank stance as OT or don't, either works for most content.