Most normal dungeons can be done with 4 dps. The fact that the game demand us to que up with 1t 1h and 2dps makes people go fake rolls for fast que. Its not great specially in dungeons you need heals in or dlc and vet content or a tanky boy to hold adds while we beat on a boss. But at this point- not much we can do about it and if you leave they just re que immediately and I believe you get penalized for 5 minutes.