Heh....that's one thing you've got to give Reagan and Trump. They both were born to be the Boss!
I laugh, but the ability to appoint highly skilled people to tasks they're properly matched to, then leave them to get the dang job done, is actually quite high on the scale of leadership abilities.
As Chief Honcho In Charge, it's their job to get rid of poor performers and replace them with better performers. It's how Reagan and Trump achieved so much in their respective fields.
Lincoln learned on the job how to properly pick military leaders.