Forcing more active mitigation through more challenging damage patterns is interesting. Forcing more passive mitigation where you press a button to stay turtled up is not. You don't want to go back to the old stance system. You might think you do, but you don't.

Also, the "tank stance debate" was two people arguing for the sake of arguing on why we can't 'maximise our mitigation' or why we can't redesign this game into a new game in which we 'maximise our mitigation'. There was never any real debate on how this game gets played in practice.