It's easy to understand if you look at it realistically:

- If you queue alone with random people, you can't argue, for you were the one who accepted the random queue.

- If you make a partyfinder specifying you want everyone to DPS, then you can argue if somebody doesn't follow your specific rule.


Whenever I queue for Leveling or anything, there are dungeons that are done in 15 minutes, while others on the same map lasts for over 30 minutes, and for my personal experience, the best you can do is just salute at start and point if a mechanic is done wrong. Don't waste your time about the DPS, just do your job the best you can to finish faster as possible.

You'll never change somebody's mind in a videogame, so every minute invested in talking about "a heal or tank should do DPS" is a minute lost forever.