If you're dependent on having your feet in a fixed position, you're not moving them fast enough when you are moving.
Not sure I understand your point. I thought those who always have to reposition their feet so they're facing the target are the ones who are more dependent, and those able to shoot in a direction the feet aren't positioned for (if NECESSARY) are less dependent on a fixed position.
Shooting on the move is a different issue. Going left frometarget neccesitates one handed shooting, going right from target allows two hands. Only thing the feet are doing is hot footin you the H#%$ outta there.