just did a 50 dungeon with a synced 72 blm. tank pulled large groups and this BLM sat there and spammed fire 1.
1. Did this person not notice the fire 3 symbol glowing when it procs
2. At level 72 did this person not ever notice that Fire 2 ever existed.
and of course
3. does this person even care.

Most of these people fall under category 3 and explaining anything is a waste of time, the game is simple and I think enough resources have already been spent on new people, people do need to help themselves and no in game training hall is going to magically make someone good. Its up to people to practice rotations in a static environment via a dummy then practice in real game situations(I don't knock anyone making mistakes in there rotation, hell its a breeze of fresh air when you can tell someone is at least trying) For the people who try and its a job I have a lot of experience in I have sent polite messages afterwards offering some help if they want it some have gladly taken it, some have said no thanks there still trying, some don't respond but that's fine.

However you do get people like the BLM I had and basically got 2 choices kick or get through it because people like that won't listen and will likely get angry if you tried to explain anything. There is a difference between casual play and I just want people to put up with me not wanting to actually play this game but I want gear.(still not sure why people like that play the game, some people argue that there just in it for the story but why pay a sub and waste there money when they can watch story videos on youtube) Either way to each there own just wish they understand that there is 3 other people that depend on them and in other cases 7 people.