I understand that higher armor and such reduce the size of each hit and this relates to how much damage must be healed. But when viewing the hit as a percentage of total health, how you reduce the percentage of health lost from a hit does not seem to differentiate between whether it was because of higher stamina or armor/block value/sanctuary. It seems like it is just a difference in semantics, although I agree that perhaps your definition is the more popular and generally accepted one.
Edit: I guess it depends on what you consider more important. Reducing the total damage taken over the course of an entire encounter and the effect of damage taken on healing required and its relation to healer mana required versus the role of mitigation in surviving smaller time periods (e.g. 4 consecuitive hits and such).
While there is a threshold above which you will cause healers to run out of mana, I think this threshold is rather high in TBC for most encounters and the restraint has definititely been relaxed and healer mana efficiency has been much improved. Healing seems more about dealing with spike damage than mana efficiency lately (except perhaps on the illidari council or mother shahraz in SR healing gear). In that regard, I weight the discussion about how to survive 4 consecutive hits with proper mitigation as more relevant than mitigation's effect on healer mana. And so, in that regard, I see my definition of it as equally important as yours.
Of course, it is still just semantics.
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