What to manage as a tank?

[CKNovel]

I didn't play WoW but I wonder why people quits that game.. it must be sucks playing as a tank that have nothing to manage other than healing party..

WoW did a comeback since their lowest point during Shadowlands.
Healers in WoW have other things to do than HP management.

Also you should be aware that healers absolutely don't need to stop DPS to heal. Top healers will never GCD heal unless there's no target.
In case you missed it, that's exactly the complains from a major numbers of healers, they don't want to DPS, they want to heal.
The same way, another side of healers are complaining because they press the same GCD and reset the same dot to DPS.

You should be aware of the healer status, it's very disrecpectful to make claims and demand for changes when you play neither of the two roles.
Also I still see no data, only your opinion.