Yeah I think it's the pressure-cooker work environment today. Nearly all my previous bosses were all the mentor-type. My current boss shouldn't be a boss. He works in tactics and not in strategy and manages up. He's very proficient technically but does not do a thing to advocate for his people or move them forward.
I don't know how much he advocated for his people but this reminds me of an engineering manager I worked with. He was always overwhelmed with work because he was a nerd at heart and didn't delogate shit. Is your role highly technical? Sometimes those guys would rather do the work themselves.