> society to not hire someone because their skin is too dark.

In SV, I can't imagine this being that common. However let's take an example. There's an interview for a position and the interviewer is a white American. Two applicants of equal skill apply. One of them is African American who's attended the same high school as the interviewer. The other one is a recent emigrant from Russia who is skilled technically however his "cultural awareness" might be lacking. Who is more likely to get hired? This is a rhetorical question. I actually don't know.

You're changing the subject. Let's stick to your first question for now. You were asking whether the arguments for diversity of race and gender could be applied to diversity of skill.

Does the argument I gave for diversity of race apply to diversity of skill? If not, do you think I gave a non-standard argument for diversity of race?

I'm not actually, I'm pointing out a type of diversity that the commonly accepted notion of diversity doesn't quite capture.

Yet when I press you on your concrete example of diversity of skill, you immediately move on to a different example without responding to what I said.