Comment by macandcheese

Google creates an environment where you "need to use AMP" because they prioritize search results for properties that have AMP varietals - placing them in the "carousel" on top of search results. You can build a very performant static site, with terrific SEO and social share meta tags, etc. - but without AMP - and still be positioned below another property who's "regular" site is slow and full of cruft but has an AMP varietal.