Exactly, he's not.
The tRump said from the beginning he didn't need one, that he could act as his own chief of staff and now he is doing just that.
Eight or nine hours of executive time a day, calling whoever whenever the fancy strikes him and signing the odd bill or executive order that someone cobbles together for him. Taking an occasional briefing - and then getting in front of the cameras whenever possible.
He has finally achieved his idea of being president.
Oh, and the Nuremberg rallies.