If the tank really didn't bother with tank stance, then that's not the stances fault it's the tanks fault, WAR has a super easy time getting initial aggro on bosses, especially with shade walker/everyone using diversion. No reason to ruin tanks because some of them can't be bothered to to do their jobs, or can't adjust to do their jobs. But on the flip side, seriously don't disregard your aggro management skills, there's no downside to using them. If you have a proper tank that gets good opening aggro on a boss then you're just as much responsible for your aggro as they are.
