If I’m having a heart attack, healthcare is distinguishable by “what’s the closest ER”. The ambulance crew is unlikely to even permit a choice in the matter.
Water, for example, is a commodity. It doesn't matter where you get it, because water from one tap is mostly indistinguishable to water from a different tap. When you need water, you simply just go to the closest tap and you can be happy that you're getting the same quality water as anywhere else. That's exactly what you want with healthcare, too.
In fact, commoditization of healthcare is probably one of the best steps towards making it a public utility. So if that's what you want, then you probably do want healthcare to be commoditized.
Amazon Care does not provide emergency surgery at the moment.
Health care is far more than just emergency services.