Something that someone pointed out in chat the other day:
"I'm only here for the EXP; who cares how I play?"
would never fly in any PvE content. Like, you don't have to play perfectly in PvE, but socially, there is an expectation that you have some minimal, baseline knowledge of your role and job, and some minimal willingness to try to perform mechanics correctly.

I think it says something about the current rewards from the Frontlines roulette that there are people who suddenly think that being a warm body in the instance is plenty enough a "contribution."