Big self-sustain on tanks just needs a con, not advanced as the things we got.
- Something comparable to clemency aka ressource and damage-loss. You don´t want to use it, but you can if e.g. your healer needs to rezz.
- Or something comparable to Living Dead. Just made as emergency button, of course not always "you gonna die", but maybe 15s 30% less damage output while under its effect?!
- High cooldowns like the invuls have.
Otherwise they could reduce the amount of overall defs and give us a decent rotation with buffs back. Just give every tank 2 unique defs on top to work with.
Nothing is wrong with self-sustain as emergency-tools or with drawbacks if you can use them multiple times. But being like "6-8 defs + 123 heal = gg" is clearly wrong.