Part of the problem is that 'practice parties' are far and few between, all people ever post are farm parties and starting up a practice party will often get you the people expecting perfect clears. Invariably after the first wipe these 'fun' people will start complaining and then rage-quit after the second, it's almost clockwork. This makes it incredibly difficult for the inexperienced to get actual experience to satisfy those who have said experience. And watching a video isn't experience, it's watching a video. Anyone can watch a video. Nothing is a match for having slogged the fight.