And what happened to whole "don't build different markup for different devices" mantra that has been the accepted wisdom in web development for the past 4 or 5 years (whenever responsive design was discovered)? Feels like "m." sites all over again (but this time with google's CDN as a required intermediary).
As someone happy with their AMP site, I'm only happy with it on the basis that my Jekyll theme builds the whole site as a single site that happens to support AMP on the desktop page.
I couldn't imagine dealing with supporting two deployments.
