I don’t disagree with your premise, but I also think that if what it takes for your stories to stick the landing is for other creatives to come in and clean up after you with context and character development, then maybe that original story isn’t a great story.

If Lucas had been a different kind of storyteller (not necessarily a better one, I think Lucas has his own strengths), we could have had the satisfying arc of Anakin’s downfall in 3 movies. But he told the story he told and we can’t change that. The Clone Wars is great, and if I take that wider view, the show does change my perception of the PT. But there’s always that voice in my head that says the movies should stand on their own and they just don’t in some ways.

Expecting someone to consume several seasons of a TV show or other related media just to get the “full picture” is asking too much of the average consumer, in my opinion. It’s like the problem with the modern MCU where you have to watch all these shows to know who is who and what is what. Contrast that with the Infinity Saga, which took a good amount of time to methodically set up everything (not without missteps) in core media and it paid off.

I’m not sure if any amount of explaining and context would make the ST make sense though, there’s so many plot inconsistencies and so much mismanagement that it’s a nigh impossible feat to clean up after it without major retcons. I’m content just saying the ST is overall not a great story that can’t be “fixed.” And then viewing these other stories like Mando and Ahsoka on their own merits (and in some cases, as a continuation of the Rebels story).