I don't care if a healer doesn't toss damage spells, it's not their role, but they better damn well be on the ball with removing debuffs because, oddly enough, that IS their role. When I heal, and I'm not in the middle of a Cure, any and all debuffs I can remove are public enemy No. 1. My cast priority is always Cure/Regen/Medica, Esuna, Protect/Stoneskin, mitigation/buff abilities and damage spells. In that order. A healer that isn't trying to remove debuffs, when able, is being a bad healer and should probably go back to their DD class.