Nah, don’t believe that it had that much of a difference between local State selection and public.
It has much more to do with human interaction and how to stop it (to me). The Constitution when written did not anticipate that if the Executive and Judicial were part of the same branch that their might be problems - they were wrong in this thinking.
Today, the Executive should NOT be able to appoint anyone outside of the Executive branch. Maybe that is the problem.
Well, I hope you read my link.
If there are any points you wish to dispute, I’d enjoy hearing of them.