Yes, I found that really striking. I am still making my way through this document, but I think there's quite a high wisdom-per-sentence value. For me, there's a lot to learn from here, and I'm very grateful for it!
It's a classic management remark, but one that you don't see that often.
One form it takes is that a manager should spend a sizable fraction of their time with the subordinates who aren't having problems. They're the ones who move things forward.