It's really hard to parse your tone from your comment, but you seem to be implying that people who think like me are A) wrong and B) advocates of homogeneous, exclusive cultures at companies.

I know about the studies showing that diversity is beneficial, and I've seen it anecdotally in my own career.

But "culture differences" are not the same as having no idea what your coworkers are talking about (which OP mentioned).

There are many instances where big corporate culture and startup culture clash. Those two environments operate very differently, and if you've spent your whole career in one, it's very hard to switch to the other. It has nothing to do with diversity. (Those studies were about race and gender.)