If WM/GB didn't disable autos it would be fine. The cast timer is more than enough to limit mobility for the damage tradeoff. Not like either class is close to mnk/drg/blm damage wise for this to be an overpowered buff. Remove the cast timer but add a cool down on the stance so that we can trade mobility for damage at a whim, but still dealing with consequences if we change stance at a wrong time.