Rawrz, I don't think you understood the point of my post at all. I'm arguing to remove Cleric Stance because it fails as a risk/reward mechanic due to HoTs snapshotting and the fairy operating independent of it's effects, and have healer DPS just scale off of one stat, MND, instead. Nowhere am I advocating removing it so healers don't "have" to DPS and can just stand around running circles/jumping/overhealing like mad. I just find it's use cumbersome and not anywhere close to serving it's original intention.
I suspect the real reason they'll never remove it is because healers will be able to go back to 8-WHM Holylol trains in PVP like they did with Secure, though. Short of removing healer DPS abilities in PVP outright, which would cause massive problems with the spells that have CC/utility, Cleric Stance is one way of maintaining healer balance in PVP at least.
EDIT: after re-reading, I KINDA get what you're saying, and while some of those mechanics like the overhealing costing more mp and HoTs lasting less time I'd actually be okay with, I think the issue is mostly that "main healer" toolkits like WHM and DiAST are too powerful for how the content is tuned. Couple that with BRDs/MCHs providing a resource regen that is usually only available through mana potions with hefty cooldowns in other games, and you have a raid setting where healers can use their most powerful abilities (some of which are on the GCD!) with ease, and without too much worry about resource management. Hence, the off-heal role is brought along mostly to shield for stuff that's otherwise a one-shot, to provide backup healing if the main healer needs it, and to DPS otherwise. In other games I've raided in, both healers had to alternate powerful healing moves because they were on long cooldowns, and everyone had to assist with healing because one healer just didn't have the mana or the toolkit to keep a whole group going indefinitely.
TL;DR punishment mechanics aren't really the solution to lack of healing difficulty, there's too many reasons that are fundamental to the game as to why healer DPS meta is a thing (BRD/MCH MP restore easing worries about resources, healing potencies and cooldowns being too strong/on short timers, etc).
Of course, this is a bit off-topic. I still maintain that Cleric Stance as a button is better off going the way of the dodo, even if the healer DPS meta is here to stay.