Traditionally and historically, an American president's Cabinet was a group of advisors to the president. No one has experience in every facet of governance, and everyone at times needs advice from someone with specific knowledge -- or simply a different perspective. That was the role of the Cabinet. Until 2017.
Now once again, half the public, many elected officials, a number of past and present ranking military officers, and reporters from all over the country and the world gasp at each new appointment made by the president-elect. Why? He is also a former president, so you have seen this act play out before. What don't you understand?
A man who does not want advice and does not see that he needs any is not looking for advisors. This man, as we have seen before, wants flunkies. Toadies. Yes-men and -women. Anyone not ready to nod like a bobblehead wouldn't last a week in his Cabinet, and anyone seriously qualified is, ipso facto, disqualified from the get-go.
Really, what else did you expect?