http://forum.square-enix.com/ffxiv/t...=1#post2021685 some of my input on the issue.

Almost every team will disband because they are shocked by the difficulty increase from HM -> EX, so impatience is the reason. People do not read chat or even speak english, i started marking everything to attack/ignore and it gives good results. The part i cannot change is the disband after few wipes, so i try to do my best teaching people (using marks).

Also, EX primals are not a quest - it's an endgame content that is supposed to take weeks to pass. People new to mmorpg seems to be unaware of this.