All of this only really applies to pre formed parties/ statics or a lucky group where everyone knows their roles.
U cannot solo heal bad parties that get hit by stuff they shouldn't.
Try qeuing up as an over geared healer for ultima hm. Chances r u'll get a party filled with a lot of 1st timers ( cuz they just wanna clear it ) who will eat a lot of aoes and eventually die. You know u shouldn't rez them cuz weakness/ brink of death is wrecking their max hp but u have to so the party can meet dps check. Decisions decisions.
I know from farming it for the ultima card ( ironically i got it from a gold pack ) all those wasted runs gg.