Motoko I totally understand your point. And I wish All tanks and end-gamers have your maturity. And yes I would luv to improve my game play if I am failing.

Anything that indicates that the run could be slow or challenging causes many players to just quit before even starting the run.
And Having the DPS meter within the duty, will just cause more frustration. The first reflex will be "Your DPS is low" -> vote kick for AFK. That is why I am against it.
ONLY have dps meters on dummies for practice is my request.

The basis of this game is to have fun. And to learn among friends. But when your network of friends are not online or not available. PUG's become the last resort for joining a duty. And this is where ragequitters are seen and elitists peek out.

And I want to confirm that NOT all runs are this frustrating. But out of 10 runs there are 5 runs with players that are disagreeable.