I was in a Qarn HM run earlier and had a SCH doing more dps than the DRG LOL. He was in Cleric Stance though
I just had to be in full VIT/parry gear and manage cooldowns appropriately but afterwards, the damage done by that SCH was worth it.
Much better than going in STR accessories and/or removing Defiance to add 50 more dps as WAR.

Tl ; dr Healers should dps if the party doesn't die, that helps cleaning the dungeon faster. No reason to have an afking healer. That bard you encounter was a total moron