[too many cooks spoil the broth] or [stew] A project is likely togo bad if managed by a multiplicity of primary movers. – A proverb.
When several people acted all at once in trying to reshape thecompany’s investment policy, Tom spoke up and said, “Let me do this bymyself! Don’t you know that too many cooks spoil the broth?”
I've decided start a new project.