The only skill every tank needs is provoke..

They don't all need mitigation they don't all need gap closers just a hate grab that's it.

Tank A for example has 50k hp could have a skill like rampart that reduces damage taken by 20%. So a 50k tank buster would smack them for 40k damage. Tank survives with 10k hp.

Tank b could have 50k hp could have a skill where they go RAWR!! And there max hp goes up 20%. So now they have 60k hp get hit with a full 50k tank buster and survives with 10k hp..

Just 2 very different ways of dealing with damage... homoenization not needed at all. Same goes with every other role..