Originally Posted by
Kisho
The stance is intrinsically linked to the fighting style. You need to be in the right stance to perform the right fighting style. You can't just swap and change.
To translate that to WoW, you need to be in the right stance to be a Brewmaster, Windwalker, or Mistweaver. You can't just choose your stance, because then you aren't prepared to be a Brewmaster or whatever. You can't do the Brewmaster moves.
So no, this isn't a good idea, because from a thematic perspective it just goes against the whole 'martial arts' idea. Sure, from an aesthetic perspective it's good to have the choice of which you prefer, but that's just not how it would work. Not in the Mistweaver stance, you can't heal. Not in the Brewmaster stance, you can't tank. Etc.