I feel it isolates the string tracking also, which might be number 4 on your list. Both usx n dsx turning around as you said.
The impacting is what is removed. And why your mind can foucs on the air time movements rather than be overiden from the impacts against the string.
C is only a big deal if you’ve not set your hand up in the air. As I said jokingly what you do in the air is far more important than the impact. So why not try focus on it?