Not on event. I've been in Event versions where they let everyone out but if players don't try to target one at a time, things won't go well. It actually makes the instance go longer because it's too much for a tank to manage, then they go down. Then maybe the heal, then the top DPS, etc, etc At least in Phoenix Cannon a tank might be able to sneak in a block and gain some immunity. It's not as feasible with Barbatos and his pulse beams. Also, Dark Robin's can lock up the tank which will mean death usually.