The pickings in DC were slim - pretty much no one in DC who had the patina of experience wanted Trump in charge. He had no choice but to rely on others. As I recall he had a hard time finding people to fill some positions.
I’m not sure if he’s abrasive or not - he did go through some people fairly quickly. I once read something by someone who did a business deal with him. Apparently 3 ivy league types who were used to being treated with the upmost respect went to meet DJT at his office in Trump Tower. The guy said that he can’t say they particularly liked DJT, and inferred that they were used to more butt kissing due to their positions in life, but that they got a fair deal and it was done quickly.
Personally I like people who say what they mean and mean what they say. Results matter - not butt kissing.
Two strengths I thought he had when he first ran:
1. His ability to hire good people.
2. His ability to fire.