Earlier quoted context omitted.
What does amp give me that a non-js page can't? Also, applications aren't the target for amp.
Can you write a carousel without JS? A live blog? Lazy loading images and ads? A stateful e-commerce product page? Have a look through the list of AMP components, you'll be surprised what's possible. https://www.ampproject.org/docs/reference/components
Google loves AMP because they (and only they) get to still track users.