The thing people can't handle with this is that intelligence tends to be heritable* so the more intelligent workers you need the smaller and more racily similar

The thing people can't handle with this is that intelligence tends to be heritable* so the more intelligent workers you need the smaller and more racily similar the successful group is going to be which runs directly contrary to the currently popular world view. *It's influenced by other things too of course. Once you hit a (fairly low) limit it's going to start skewing more and more male. Upbringing is a huge part of it too so children of divorced parents tend to perform worse etc.