> Should a page with a fraction of a fraction of a percent better content that takes 20s to load and is barely functional on a mobile browser take precedence over something that actually works better for me as an end user?

Yeah, but that is asking a serious question looking for a serious answer. Ranking things is a challenge.

If Google's answer is "got to have AMP" then we might suspect the question was the rather less profound "how do we make the internet good for Google?".