Tbh, inter-role balance and intra-balance are basically never worth considering together. The ONLY reason to do so is in considering the balancing point between (comparatively)"scaled" and (comparatively) "flat" values, since those can only be balanced under a certain expected intake.
Pick a target sustain requirement (pre-mitigated damage to be done to the tanks), then tune flats (including tank self-heals) against the scalars for that level of intake. If it makes healers irrelevant is only a concern by which to nerf ALL tank sustain, never just tank self-heals.
Will most tanks likely need to offer a mixture of flats and scalars? Yes. Absolutely. Else flats simply rule low-intake content and get avoided in all else. But that can still be diverse enough even without arbitrarily nerfing one set just because their sustain happens to be a bit more obvious in its bouncing of the health bar.
P.S. For Warrior, specifically, one option is just to offer a higher initial HP pool and a bit of natural scaled bit based on how much in %HP the hit would normally reduce them, to offer additional gauge based on intake, and to offer some fading overlappable benefit on gauge spending, such that they seem to "rise to the challenge" and can scale accordingly even if having mostly flat sustain via each ability. That said, I don't see why flats would necessarily be more Warrior-like than scaled hits.
Again, that's just a matter of flats (same as a fat TBN with a bit more duration to nonetheless ensure it's fully consumed) and, if ever advantaged over scaled skills in a majority of real content, too small a sustain requirement in general.there is a scenario where it is just free mitigation with no input from a healer required and that is when the damage received is less than the total HP increase as, once the buff wears off, your HP will just go back to it's baseline



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