I think Revenge of the Sith proves both paths are options in a given story, still the series shouldn’t be without a hero exactly or wholly reject redemption as a been there done that, the themes are too universal. For me Star Wars is a lot about trust and agency, so Star Wars should be about good and evil and making the right choices in that way, as long as the characters who fail to do so are represented as having tragically failed, Kylo for example wouldn’t have to be turned good but would need to be tortured deep down to remain bad without breaking the ultimate moral.