Luke’s lightsaber was green because it wouldn’t have looked good against the blue sky in Return of the Jedi. That’s it. That’s the reason.

Not even the filmmakers get their panties in a twist over “the lore” like that.

I would like to see a “dear leader” type of Sith someday even though it goes against that philosophy. I’m a sucker for sci-fi dystopias so I’d like to see more stories like Andor; only a step further, where it feels like most of the galaxy is in support of the Empire(or whatever faction is in power) and you have a “evil corpo” kind of Sith in control. Thrawn is probably the closest you can get but I’d like a character who can tap into the Sith/force lore as well.