Shortly after the expansion dropped, some friends and I did leveling roulette as a full party, so we could go with an off composition. We did three DPS and a Paladin. We got Mount Gulg. Wall-to-wall pulls, paladin only died once to an accident before the second boss.

Take what you will from what that says about how absurd tank self-sustain is, or how useless healers still are, or whatever else you want to find there.