You would think that with ten super-famous people in one movie, it's gonna be ten times more popular or viewed, but on some level, they can cancel each other out.
The more people involved in making a movie, the worse it is, generally.
Don't put too many chefs to work. Sometimes they get too involved in the ingredients and are of no help.
Sometimes shows suffer from having many cooks in the kitchen.
Maybe, early on, I had too many coaches, with three or four guys all giving different input.
If you bring in actors right when you're breaking story, it has a 'too many cooks in the kitchen' effect.
If you let too many cooks in the kitchen it could cloud your vision of what you want to do.