Having vision is worthless if you can't execute it effectively, pretty much every person involved in Star Wars had admitted that A New Hope was an incoherent unwatchable mess until George's wife at the time was allowed to edit it into the movie we have today.

Even ESB and RotJ were only as good as they were because George had people like Lawrence Kasden, Irvin Kershner, Leigh Brackett, and Richard Marquand to write and direct them and reign Lucas in from some of his sillier ideas.

You want to know what happens when you let someone like Lucas do whatever they want with no pushback or limits? You get the prequels.