> On the other hand, by having Amazon control the to-the-door experience, that gives them incredible granular controls over how things are done, when, by whom, and how they do it, including how they are supposed to treat you at the door (if you're there), what to say, etc. etc.

You can't exert control (e.g. uniforms, greetings, etc.) over independent contractors, so Amazon would not be able to do any of this under their current model.