Your point was addressed in my initial post.
Specifically here:
I'd LOVE to see more interaction with the gauge on all tanks, not just GNB, I don't see it happening with mitagation since, iirc from what I've read, we HAD that and it was REMOVED.While I would be all for HoC to be tied to the Shell gauge... with the way SE wants the game I don't see it happening. And even then I see issues since Double Down costs 2. Rather, HoC should be more akin to TBN in that there is a set of damage that the GNB has to take first in order for the heal to be applied. This way they don't have a free recitation, they actually have to have the damage be applied first.
More to your point, I don't find, in general, it to be a good or even FUN mechanic to have a barrier interact with healing from the healers as a solution to dilute tank sustain. Its an idea. Its not one I welcome. Regardless of whether its on Aurora (which to me personally doesn't fit, hence why I mentioned it) or on HoL.
I didn't mention the other tanks because I don't play them enough to feel comfortable in addressing them and would rather mains of them tackle it cause they know the classes better but -
Clemency is probably the best out of those since it uses MP, and the rest are free, but I would argue that Aurora being weak as it is (and NO SE it doesn't need a third charge) and Abyssal Drain being on its 60 CD is fine, at your oppertunity cost as it were and don't need to be tied to anything.
Bloodwhetting has plenty that can be done with it. Increase the recast timer, out right nerf the amount in and of itself (how is w/e). Tie it to rage, change it from being a heal that imo doesn't belong on WAR and instead make it into another Thrill that either increases HP per hit for X seconds for the WAR or the Party (or a shield) up to a certain amount. I don't exactly CARE what happens to it persay so long as it gets addressed.
Divine Veil and Shake it Off (over time) are out of my depth outside of - does PLD/WAR need extra group healing in this economy? no - but in theory I don't have problems with either (other than SiO has no business being a HoT on WAR). Again, could be tied to gauge. I'd find that to be interesting. I don't see it happening.