Just because you're free to do that doesn't make it good. Yes lets load up on MAB to slightly raise 1 attack for our PUG. That sounds phenomenal (obvious sarcasm).

This is a different game, sure we can take what worked in XI but we don't have to take everything. There are combinations that can be made that will feel unique with a board or a tree. It all depends on what new abilities/traits they come up with.

WoW has (had) something called "Shock-adin" that came from people loading up certain talents/abilities to raise their AoE power on Paladin. Players would use this to effectively AoE grind.

It wasn't something the developers had in mind but something that was created by the users. Saying that that cannot happen here or I'm not letting it happen is asinine.