Honest question. Players who only want to share parties with people who are experienced and know their class cold, who follow their rotation by the book... why not just use party finder and include a small note that says you prefer to play with very experienced players who are confident in their rotation?

It's not reasonable to expect everyone to play this particular game the same way. It's not as simple as tic-tac-toe. Some people go in with an RP focus. Some people go with lore or glamour focus. Some go with mechanics focus. Some like a little of everything. You're only going to be disappointed if you go into duty finder and expect everyone there to conform to what you're looking for, and if your reaction to disappointment is to lash out then not only are you going to have a bad time, so will the other people there. Why do that when you have a better chance of getting what you want and not making others miserable in party finder?

This isn't a matter of whether you're allowed to give critique or not give critique. But there's a difference between going "hey X, you should be using Grit here" and going "GDI X stop being such a shitty dark knight and put Grit on you're slowing the whole party down". Having someone react badly to the former? Yeah, that's obnoxious. But the latter even if the critique was valid is going to wreck things all around when it didn't have to.

Again, I mean this all sincerely. If there's a reason party finder wouldn't address the problem I'd like to know. If it might address the problem but hasn't been tried then that's less frustration for everyone.