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That was the argument that carl was making. He said that during a backhand stroke, your arm only moves a short distance(assuming that you directly facing the table or your shoulder is parallel to the table). However, I replied to this issue with the question of why not stand sideways(stepping around) such that your right shoulder is facing the table or even slightly showing your back so that your upper arm have more room to accelerate when swinging outward. Plus, now you can use your waist more by turning and use weight transfer which are not possible when standing parallel to the table with a short stroke.
You can do that, but you'll leave your forehand side wide open. It will be very difficult to get ready for a forehand position if your opponent manages to return your shot.