Thought Diversity is a great concept that works best when a new idea can be hijacked and used as the boss's own idea.
Otherwise thought diversity is just window dressing along with theoretical sick days, impossible to schedule vacations, working holidays, expensive affordable healthcare, and the old fashioned coffee break.
The PHB problem. He needs people to build his empire, but he basically hates people. So his solution is to hire for headcount then ignore their ideas. And treat them just badly enough that they hate to come to work but won't quit.