Not being sarcastic, is there evidence that more diverse teams are better? There seems to be some anecdotal evidence going both ways (i.e. more diverse viewpoints vs team cohesion). I can imagine that there's a balance point as well. You could have one extreme where people are so similar that its basically a one-person team with 8 arms. You could also have a team so diverse they can never agree, have no common language and no shared cultural aspects, or even shared goals. An interesting balancing act really.