The idea of one stance being dedicated for AOE is good, but there is too much interactions not to make them either broken, or mandatory.

I think the change to snap and bootshine are good, and maybe to tackle, but nothing more.

Make earth stance beeing a solo stance with additional reduction : No more positionnal but reduced potency, tackle for control, damage taken reduced and RoE for increased survavibility.

Wind stance being either focused on AOE or being the single target one

Fire stance for what remains, ST or AOE.

That would be cool, less flexible at some point but interesting overall.