You don’t have to dig very deep into most books about management or leadership before you come to an admonition that in order to be an effective leader or manager you have to learn how to delegate.
What could be so difficult about that?
I mean, why would anyone have to struggle to let someone else do some of their work? Delegating makes work easier. Heck, it frees up time for personal as well as professional activities – which is to say, it makes life better. Why would anyone resist that?