It is quite possible you can learn something from feedback accompanying a rejection. I’m sure someone has. A recent rejection of a story of mine was accompanied by feedback from two of the slush readers for the magazine:
“… really strong narrative voice and prose control. … it’s all developed and described quite well”
“This piece is unfocused and almost stream of consciousness and difficult to get a sense of what it’s about”
Guess what I learned? Flip a coin.