This is clearly not true, Lucas cared a lot about his story and universe.
AHAHAHAHAHAHAH. Oh wait, your’re serious. Let me laugh even harder.
Movies should not be aiming to do only the classic adventure story over and over again, and the prequels weren’t bad because of the story.
Right. Movies shouldn’t. But Starwars should. But that’s not even the main issue. The prequels are just terribly written, no matter what genre they were supossed to be. Bad story, terrible characters with no development, inchorent and self condtradictory and padded with stupidly long and boring action scences. They are just bad movies. A director couldn’t have fixed that, they would need a complete rewrite.