I think a lot of the problems with team dynamics was communication. Everyone's different and when your in a PUG where no one communicates. Then no two members of that team, knows the goal of a given mission. Maybe 55% of the team wants to speed run. While 35% wants to sweep rooms and then the other 10% wants chaos?
The most effective teams for me personally, where the ones where the group leader would send a tell. Saying something like "Hey, we're doing some council mission in PI at +4, tank is lead follow their directions and listen for the healer to call buffs."
I Accept and enter the mission. Tank says "Pulling room to this corner." Everyone stands back, waits for the tank to pull then go to the corner, mobs pile on the tank. Tank taunts and everyone unloads. KB, not a problem if it's aimed right cause the mobs are in a corner.
Or, Team lead sends a tell "Hey, we're doing a TF we're going to speed run where we can. We'll let you know when, the rest we'll clear."
I don't know, maybe it's just me but if what the team leader was saying. Wasn't what I felt like doing at the time. I'd decline or if I wasn't sure what the goal of the group was, I'd ask.