The fact that cognitive diversity matters does not mean that if you assemble a group of diverse but thoroughly uninformed people, their collective wisdom will be smarter than an expert's. But if you can assemble a diverse group of people who possess varying degrees of knowledge and insight, you're better off entrusting it with major decisions rather than leaving them in the hands of one or two people, no matter how smart those people are.
Sadness is a very interesting idea, this idea of sadness being some kind of default setting that artists will go into. And then I started thinking about this idea of sadness and happiness, and the idea that sadness is very loud, and happiness is quiet.