There were many instances in the OT where he was told he couldn’t do something, they didn’t have a way to shoot it or it just wasn’t practical or they didn’t have the money or whatever. Marcia and Gary and others definitely checked some of his whacky ideas, doctored his scripts, etc. Gary and Kersh were pretty much in charge of Empire while Lucas panicked about losing his money.
Of course, George Lucas played an enormous role in creating and bringing Star Wars to life, and he deserves credit for all of that. But all people, including those of us who criticize him, have our strengths and weaknesses. I think his weaknesses were restrained and covered up by others, but you do see them pop up throughout Return of the Jedi. Cutting corners with cheap production values, burping and excrement humor, pandering to children, breaking the fourth wall. It’s all there in Jedi, once in awhile between other really terrific scenes.
Then there are the prequels where that stuff just makes up the whole movie, when people aren’t sitting around or standing and talking at least. The wild shifts in tone and inappropriate humor, if you can call it that. People don’t develop those traits as they get older. You don’t go from making realistic sound films to suddenly deciding its fun to have CGI characters stepping in **** or cut from a scene with kids being murdered or burned out skeletons to slapstick comedy sequences with robots smacking each other. A grown adult just doesn’t do those things, and so it’s clear to me at least that George Lucas has the mind of a child and always had the mind of a child.
In some ways, that was a strength and made him and his films successful. In other ways it was a negative, and is what made the prequels and special editions unmitigated failures.