I find it kind of funny that one of the deadliest enemies in terms of auto-attacks is the Yan from M6S. Bosses should not be hitting for less than these small things. A tank should always be in danger of dying when their mitigation abilities are on cooldown, and not just shrugging off the attacks while healing others.

Heavy auto-attacks would improve healer game play as it will actually force them to use their GCD healing abilities and not just be DPSing most of the time.

I'm fine with the way tanks currently play, although it would be nice if positioning the boss played a bigger role. That's one reason why I find the add phase in M6S so interesting as positioning does matter or you're going to make it harder to cleave things down, cause the yans to enrage, or drop puddles in a bad place. Far too many bosses just teleport to the middle of the arena and then face north to do most of their attacks.