For example, you have a lightweight website with size of 140kb for everything (html, CSS, js, images) without AMP. It works blazing fast and you get 100/100 scores on any website speed meter.
But it was not enough for google, because you don't use their super-duper AMP tech.
You known what? Your website doubles in size when you implement AMP, because you must load several additional scripts to make AMP work, and not only size increases, load time (from click on your website link till full render) will increase too, because additional js processing to make AMP work.
The only benefit was preloading and heavely caching by Google, so user feels like website shows instantly.
I "optimized" several lightweight websites with AMP and every time I had exactly one thought in mind - that's useless stuff adds more problems than benefits, except mobile search ranking.
Thanks God now AMP is not mandatory to be in google mobile search top
Ex. Here's Snopes: https://www.webpagetest.org/result/210818_BiDcQB_f0db4233292...
For sure a static site is faster than AMP, but I'm pretty sure AMP is faster than most sites regular folks visit on a daily basis.
Try to apply AMP to it and see the difference...
It was very convenient that these things could be bundled in a package with some webdev best practices, a JavaScript framework, and marketed as a (questionable) speed improvement.
I've worked for a publisher that abandoned serving their own fast no-JS article pages in favor of half-assed AMP pages full of slow iframes, because Google favored any use of AMP over actual page speed. It took Google many years to ease that AMP favoritism.
Everything else in AMP served that.