Originally Posted by
Maku
You are correct except you don't take into account that healers have many ways, at least WHM and AST, to massively heal a crap ton of HP in an instant.
If a tank has lower HP we have to spam heal because our massive healing combos/oGCD skills will over-heal, which is worthless MP/oGCD/Enmity generation.
More HP = we only have to use out Burst heal combos and can DPS for a substantially longer time, which will out DPS the DPS diff from STR rings.
Low HP = Spam normal GCD heals and never able to DPS