When Miller was advocating ball position relative to left shoulder, Nicklaus's " Golf My Way" suggest ball position off left heel.
Ball Relative to shoulder makes much more sense to me seeing how the TSP and elbow plane is much more connected to zone 2 mechanics.
I think trying to strike the ball is easier once it's line up with upper body and arms.
I saw JB Holmes on playing lesson hit a 300 yard drive on his knees, that pretty well blew way my consideration of Nicklaus's suggestion.