So slow page load speed is a non problem and speeding up delivering content is not a solution? Whether you like it or not, if you search on Google, you are using THEIR platform and you are THEIR user. What they have determined is that their users want to consume content faster than what is traditionally available on the web. So you'd rather wait 3 seconds to see your ebay listing than half a second? For the open web, javascript bloat and google is taking over the world reasons. That suits you fine but not the majority of users on Google. Why would Google be implementing a technology that is BAD for their users?
This is about consolidating more time and data on their systems. You never leave a Google server with AMP. UX is secondary benefit used as marketing to force this on sites along with search rankings.
Also Google owns Doubleclick which is the biggest and slowest ad server on the planet.
It isn't imposing, and as a user who frequently travels to emerging markets, it is a problem, and as a user, I see this as a solution, I usually prefer sites with the AMP logo because my general impression is that they load far faster.
Maybe you're just not the target user for this, or even for the Internet. And to be honest, pretty much nobody reading HackerNews is the target user for this.
Solving different problems on THEIR platforms.
AMP is just imposing a non-solution to a non-problem on web users.