Star Wars was the immediate one for me. I have never seen 9, I will never see 9. I don’t watch any of the Disney+ series. What i loved most about Star Wars was the mystery that they are going through one by one to write the entirety of the story instead of just creating new stories in the universe.
By not killing Palpatine at the end of ROTJ, and making him the villain at the end of TLJ, you’ve effectively spoiled Vader’s redemption arc