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It most likely has multiple benefits for being palms up structurally beyond just pulling. I don't know of any martial art where one position only had one benefit and one application of the movement.Maybe this is the origin of the palm up position on the hip most styles end the returning hand with, the result of the twisting action?
Body mechanics probably plays a big role in palms up. We simply get better usage from a lot of things with palm up. Do a high deep chamber and punch. Try it with the palm up chamber and then again with palm down chamber from the same position. You should be able to feel the difference in the two right away. Try doing an upper cut with palm down. vs palm up.'