AMP still makes no sense. On iOS, Android and Windows it’s completely broken and friction increasing to grab a link to send to a friend in another medium. Not only that but it seems the page slightly degrades sometimes. For what? A theoretical page load time improvement? Maybe that’s naive but we already have “request desktop mode” to allow for bifurcated experiences. Why do we need a third thats seemingly even worse…
It's a lot of effort to maintain AMP pages for all your site content alongside the standard pages over time. That's why they tend to degrade.
They want your canonical web page to be AMP.