M+ has roles, but each role is still expected to do the function of a job; which is clearing M+.
I’ll be super honest with you though. Outside of Resto Shamans during a specific CD, healers don’t dps. I never see it. Healers (especially priests and druids) can completely trivialize certain affixes, such as explosives. They typically won’t, or don’t. At least in the pugs I’ve been in.
I can’t count how many times I’ve watched healers allow dots to pick people off while contributing only healing to the group.
Healing is not an easy role. In fact, healing is the hardest role in M+ when played correctly. The way most healers are playing healer atm, it’s the easiest role to play because they’re coming in and only healing. It’s why Hpal and MW are relatively unpopular in M+. They’re very difficult to play compared to standing in the back, planting; and casting heal spells. I’ve seen so many healers just facing random directions casting only heal spells. lol