These are the fun, but token advantages of diversity in this specific context. There are lots of advantages and disadvantages to diversity - because it is an extremely generic term. I have first hand experience of teams completely losing all the original members, who were extremely talented and all born in the US, because they hired such a huge number of people who were from a different culture (India, in this case). It had nothing to do with racism - they just had nothing in common. It was fun to talk about their different religious celebrations and so on, but they were emotionally aliens. They were reasonably smart, yet there was zero intellectual spark in conversations between the two groups. They were just too different to thrive with each other. Different culturally, ideologically, intellectually, emotionally. Different in methods of communication, in treatment of the business hierarchy, in assumptions and expectations. We can blame the business for making an incompatible team, but the compatibility parameters were too tied to culture and race. It's hard to account for that without essentially being racist.

Diversity can be rewarding when it's actually diverse.

Being the only American citizen on a team of people constantly speaking Hindi or Tamil often isn't "rewarding."