I guess I'm in the minority, I have no problem with CG Luke, or any other character for that matter, if done right. I keep hearing the argument......"just recast him". But if technology exists to bring a character back in a more believable form, then great, let's do it. It just needs to be done right. If Sebastian Stan can do a young Mark Hamill the way Anthony Ingruber did a young Harrison Ford in Age of Adeline, then heck yeah I'm on board. The goal here, whether CGI or recast, is to believe you are watching the younger version, or a version, of a character you already know and love. This is one of the many reasons why Solo, for me, failed. At no point did I ever believe I was watching a young Han Solo. No, I am not asking for an impersonation or a full blown movie with a CG Harrison Ford, but I am asking for a connection outside of a simple gesture, wardrobe, prop, or piece of dialogue.
As for the argument "why go back to the well, do something new with new characters", they have! Some of the most compelling characters, at least for me, in the Star Wars universe are Cassian Andor, Jyn Erso, and The Mandalorian, all people who never existed until these movie/series were made.
The reason they go back to the well is because these characters have so much more story to tell, so many questions fans want answered. But more importantly, there is an allure for these characters and this franchise unlike any other, one that's kept it relevant for 43 years. And sometimes it's just because we want to see them again in maybe a way we have never seen them before. While I agree many fans aren't on board, I see more compelling responses for than against.