What is crazy is in HW we had sustain and mitigation. Literally they could add sole survivor effect to oblation to provide a heal after x amount of damage mitigated or at the end of the cast. But that is a expansion or focused patch level change.

They can adjust cure potency, but what would they do it to? Souleater?

I do think they may have overbuffed the other tank jobs without considering DRK.