BATES MOTEL pulled a fast one on viewers. After spending several seasons presenting itself as a prequel to PSYCHO (albeit set in modern times, as opposed to the 1960s), it veered off in the final season to present a whole new ending for Norman Bates. The turning point being when Marion Crane decided NOT to take a shower after all.
I suspect this wasn't the original plan, but more that producers eventually decided, as the series finally caught up with the beginning of the movie, that it would be kinda pointless to spend the last several episodes just remaking the Hitchcock film.
Hmm, I never thought of that. Believe it or not I didn't start watching Bates Motel right off the bat, even though I'm a huge Hitchcock fan (best director EVER...just sayin). A friend of mine told me I should watch it. She thought it was a good show and knowing how much I liked Hitchcock films she said I'd like it and she was right. I started in about the 2nd season. I thought it would end sometime after he murdered his mother and then follow the history we were told in the first Psycho film. But they changed things up a bit, as we know. I never expected that they would go into a Psycho remake in the sense I didn't expect them to go into Bates' adult life as seen in the film.
I wonder if part of that was because Bates' history had already been covered to a large extent. Between some of the flashbacks seen in Psycho II, then going into it in more detail with Psycho IV I wonder if the producers decided they wanted to do something different then just re-do something that was covered to some extent at least twice before.
As for Star Trek--I'm not a big fan of reboots. I've sort of looked at Discovery as a sort of reboot, but I'd rather not. Actually, I'd prefer them just to continue moving forward in the future. That would eliminate most of the continuity problems and they can make it as futuristic as they want, technologically, society, scientifically, etc. Any changes, much like when the TNG started, could easily be attributed to it being 100 (or whatever) years in the future. They'd have to stay consistent with the overall history, but I doubt that would be much of an issue for the most part.
I actually like that storywise, it's all part of the same basic universe. Not too many franchises do that these days. Doing a reboot, in a way, is almost too easy. Sure it frees you to do what you want---but it makes it too easy. I think it's a lot more challenging to try to do what you want but work within a framework of the existing universe.