The single biggest problem with delegating authority for border closures to CHO's et al, is this. They are Doctors by profession! The very nature of a Doctors psyche is to prevent, or limit the spread of disease, no matter the cost. They are not economists, virologists or (shudder) politicians. They have no concept of the ramifications beyond their health-perspective bubble. Tell a Doctor they can "do whatever they need to to stop COVID in the State of <X>" and of course they are going to say "stop everyone coming in". Tell a Doctor "Do whatever you want to stop COVID, but obey the Constitution" and you would have a very different result.