Companies where I worked stuffed their diversity hires in HR where they thought they would do the least harm. Soon, everybody hated dealing with HR. Then, their award fees were tied to hiring them as engineers. We put them on overhead projects. Boy, I can’t wait for them to be in jobs where our safety depends On them.
That's where the corps I've worked for have hidden people.
Places that matter - engineering, sales, the C-Suite - have had people who were capable of making decisions and/or working their butts off. Strangely enough, the "diverstity" in these spots is generally pretty good. No place to hide, likely.
The most pleasant places I've worked were privately held companies, where no one gave a s*** about diversity. Great teams there, all of them. And - interestingly - fairly diverse. Amazing what people can accomplish when they're not weighed down with a lot of baggage.