I'm afraid I have to disagree. The problem isn't a lack of source material: "Star Wars" in particular have an enormous reservoir of stories to tell, particularly given that we know the Jedi date back thousands of years.
The problem, rather, is the makers insisting on having an *exact* tie into preexisting Star Wars IP – that plus a ridiculous level of caution. TPTB at Lucasfilm simply do *not* get what the audience does & doesn't want, and I'm undecided whether "Obi-Wan" or "The Book of Boba Fett" was the single worst TV show idea of the past five years. Bizarrely, Star Wars seems obsessed with filling in uber-nerdy plot holes.
"Rogue One" was mainly intended to explain how the Rebel Alliance managed to take out the moon-sized Death Star with a single light torpedo.
"Solo": It's there almost entirely to explain George Lucas's error in the first movie. "Twelve parsecs" is a measure of distance, not time, and the movie spends its final 45 minutes with an absurdly convoluted explanation for how the Millennium Falcon made the Kessel run in that *distance*. Dave Filoni did a great job on the various Star Wars animated series over the years, but handing him the keys to "The Mandalorian" and ALL of its related series was more than a bit much.
Finally, Star Wars produced an actual *original* series – but it STILL sucked! "The Acolyte" was either confusing or flat-out bizarre unless you're THE most extremist type of fan who's read every single book written about it over the past 40 years. It had a ton of promise, but in this case the showrunner made the mistake of assuming viewers were *smarter* than they were (in most cases they dumb it down for TV).
As for "Star Trek," I don't think I could disagree more fervently. "Discovery" was one of THE most wildly imaginative shows on TV, period, and it was only cancelled because Trekker incels couldn't handle the idea of a young Black woman as captain. While "Strange New Worlds" at least adheres to the same self-contained episodes ethos as TOS, I've been truly amazed at how astoundingly well they've done even given their inherent guardrails. Juggling a musical show with one of the most shocking moments in Trek history – the ship's doctor murdering his former tormentor in cold blood, after the war was over and said tormentor was assisting the Federation – somehow worked, and it should NOT have done so!
"Picard" was about as old-school as it gets, and its final season may be the single most obvious display of fan service in modern history, but if you're going that way, you need to go all in, and Picard was more like all in ten times over. While it is utterly absurd that they flew the Enterprise-D (!!!!) in their climactic battle – because Worf "broke the Enterprise E" (!!!!!!!!) – it all worked. We've had some seriously shitty series endings, but "Picard" had a great one. (Its first two seasons are another story, however.)
Agreed that "Alien" is more than a bit tired at this point. I've seen "Romulus," and it's basically "Alien but way lower budget and no Sigourney Weaver or Ridley Scott." Nothing new, and I think they should've stopped the franchise after "Aliens." Ditto "The Terminator." Most of the long-running terror series are absurdly tired, and while I know the three-part "Halloween" finale with Jamie Lee was supposed to be the end, I also know what assholes Hollywood can be in terms of IP. (Ditto "Friday the 13th," Freddy Krueger, "The Conjuring," etc.)
Finally, a franchise that *should've* gone out on top but did not: "Top Gun." "Maverick" is one of the most perfect summer movies ever made – and yes, cunts, I know all about Cruise & CO$ – and they're absurdly trying to recapture the magic again. (At least John Wick is dead, aside from flashbacks in the upcoming "Ballerina" spinoff.)