Skill trees or custom builds come up every now and again and every time it has to be said that no matter what the only build that will be acceptable is the optimal one. Doesn't matter if all of them can clear content or even perform well in the most difficult content, the community will insist on everyone following the optimal build at all times or they will be removed from parties. Even with the slight difference in performance we have with the jobs now there are some that are excluded from PF simply because they don't perform as well as others, not because they cannot clear.