This would likely mean sites with less tracking and ads - two things Google has a vested interest in.
Nobody. It's a non-issue because, despite the faults of the web, the average person is still clicking on chum-boxes, sharing clickbait, and using Google services.
Google isn't trying to save the web. They're trying to become the web. And they've already made their money, so what makes you think they care out of the goodness of their hearts?
Everyone did. It's why web apps are dead & buried, and native apps rule the world. Nobody talks about cool web experiences anymore. It's why we're all talking about the experience of viewing a search result instead of the experience of browsing the web.
Entire areas that started exclusively on the web are now dominated by native apps, like social.
The web only exists for long-tail, rarely used content. That's the actual area it occupies now. Google, with AMP, are optimizing for the usage the web has left. It's a realistic approach to the web.
It's foolish - and naive - to dismiss user experience.
This is 100% the argument that I try and explain when people say "I don't support Google, I use Brave" (or some other Chrome/Chromium browser over Firefox). It typically falls on deaf ears.
I wonder how many people supporting the imo absolutely deserved "FUCK GOOGLE" mentality use Chrome to voice their thoughts?
EDIT: @afiori comments below that this may no longer be the case.
If performance really mattered to Google, it would influence SERP and Carousel position in a meaningful way.
Actually, that's not quite right. Publishers have forced Google to forced publishers to use AMP. That is, publishers can't control themselves and are adding more and more and more bloat to their pages.
I am by no means a Google and/or AMP fan, but the truth is most sites have no respect for the receiving device and/or connection speed.