The President relied on the advice of a who’s-who of the country’s most prestigious law firms for DOJ appointees.
Even a billionaire can’t be expert on everything, and must rely on those thought to be ‘experts’.
https://abovethelaw.com/2016/11/the-biglaw-attorneys-on-trumps-doj-transition-team/
I recall Trump boasting about his ability to pick talent.
Besides DOJ, what other appointments did he outsource?