You are confusing what the purpose of an American Government is. It is not running the now 50 Republics, or their people. It has (the Federal Government) certain specific functions. Carrying out those functions, is what needs to be done in a businesslike manner. If it usurps power and tries to actually run the American people, whether democratically or from the top down; we have lost our heritage. Its duty is to serve the limited purposes entrusted to it; not to control anyone, in any way outside those functions.
OK fine. He can run only the executive branch period meaning he won’t make many changes requiring politics. He might tighten border security but there won’t be a wall for example. He can’t do much about the budget which would require politics. Why give him the job? He won’t change much just be a good executive manager.