Healer has the most control over the party.
As ppl know dps are just sheeps and will follow/ support whoever appears to be the stronger player.
It's tank vs healer more than half the time.
A healer/dps can tank a mob one by one easily.
So imo if a tank isn't pulling more than 1 mob then they aren't really living up to their role as a tank.
As a healer with a lot of experience in skipping mobs/ sleep reseting emnity/ lockouts/ kiting / and tanking as a healer, i can say that at the current state of dungeons; healers can tank everything easily.
I'm a 6.4k hp healer so wtf do i give a damn if the tank decides to throw a fit lol. That just means more commendations for me.