“A camel is a horse designed by committee.”
A variation is “a Volvo is a Porsche designed by committee.”
Some of the best product advice I’ve ever heard goes something like “damn what the users want, charge towards your dream.”
All of these statements are, of course, saying the same thing. When there are too many cooks in the kitchen all you get is a mess. And when too many people have product input, you’ve got lots of features but no soul.