That really reminded me of a story I heard when A New Hope was being made. Apparently, Harrison Ford read through the script after accepting the role of Han Solo, walked up to George Lucas, and said "George, you may be able to write this shit, but you sure as hell can't say it." He proceeded to not only re-write some of his lines, but encouraged Mark Hamill to do the same.The problem with someone getting the status of being an unassailable genius is that you can't criticize their bad ideas. It is nice that their good ideas don't get thrown into the blender of needing approval from everyone and their aunt, but it also means that any bad ideas get the same leeway straight into the finished product. Everyone, even really smart and great people, needs someone to call them on their bullshit from time to time.
My point being that having Big Ideas (TM) is all well and good, but the best of creations have that person saying "No, honey, we need to do it this way." The best Star Wars movies were made by George Lucas...but when he had someone to shoot down the ideas that didn't work and run with the ones that did. When left to his own devices completely, we got the prequels. When he was removed entirely, we got the sequels.