Yes, I don't generally care for prequels that "explain" how iconic characters came to be how they are. For a lot of them, like Han Solo, Boba Fett and The Joker, their mystique is a huge part of their appeal. Taking that away takes away something vital, imo. Which is why I'm on board for this Diego Luna Star Wars thing, because there's nothing iconic about his character. If anything he was under-served in Rogue One, imo. They can basically do whatever they want with him and not risk "ruining" anything, and Luna can certainly be a compelling lead.