The game desperately needs a redesign of the current endgame.
What I mean is, when people like me enter the current raid tier late, they have HUGE trouble catching up because by the time they reach the level where they can participate in the raid, most people have already completed it, and then they're farming it in statiics/groups.
Let me give you an example.
For the past two weeks, I've been joining every PF doing M9S, and so far, the best run I've participated in have been reaching Hell in a Cell.
We need a system that either includes some kind of "tainting ground," where we can freely choose a phase/phases of a given instance and practice until we master it, or a reward system for players who have already completed the content so they feel motivated to help others.