There's no way a director can communicate with every single person on the set and yet they need to motivate and instill an ambition to want to do their best work.
I can teach a chimp how to make linguini and clams. I can't teach a chimp to dream about it and think about how great it is.
The third group is focused on counterintelligence and security. I think the reason for that is fairly evident, in terms of vulnerabilities of the department and the harm that can come to it by failing to detect when we have, in fact, been harmed.