So, let’s say you’re a Salkind. You’ve been producing movies for your father for ten years now, including some of The Three Musketeers and a couple of Superman movies, but people still think that you’re just a money guy — specifically, your dad’s money guy.
But you’ve been working in the same building as creative people for so long, you’ve started to hallucinate that you’re a creative contributor as well. Since nobody has any idea what to do with Superman III, you sit down at the typewriter and write an eight-page treatment, which you send to the Warner Brothers and ask them for millions of dollars so you can make it.
In the years to come, you’ll tell people that Warner Bros thought it was too “sci-fi”, and too embedded in Superman lore. That is not the reason Warner Bros rejected your treatment. They rejected it because they were grown-ups who read movie treatments for a living, and yours is bugfuck insane.