Tank healing is to high

[Absimiliard]

Using multiple buttons is more than using one button, but that´s not even the point. Multiple tankbuster, where you would need to taunt, heal against stacks or whatever (E12 / E10) are outplayed by the use of invul. PLD could even bring the healer through a deadly mechanic to use LB3 after. That´s just lame.
Tanks have already way too less stuff to care for in their role. Invul makes the one last thing even worse. Not even for them only, also for the healer.

You do know the fights are balanced in part around tanks abusing their invulns, right? Making effective use of your invulns is very much part of being a good tank, and it certainly does qualify as a role responsibility despite all the protestations.
Invulnerabilities trivialize nothing. You are still going to wipe if the rest of your group isn't holding things down on their end.