Having Hayden appear IMO makes Anakins redemption less meaningful and deceptive. It almost pushes the idea that had he survived we are to think he will just return to the whiny young Jedi he was years ago which I think most of us will agree wouldnt be the case. IMO the redemption is more about a man turning his back on evil for good than simply reverting to who he had been many years before. The spirit Luke sees is the redeemed man who saved his life, not the whiny arrogant Jedi who would ultimately turn his back on good.
Thank you for saying this, so I don’t have to.