Yea - that was my first experience using it for some of the news sites and I ended up spending a weekend redoing my entire site to do pure AMP for desktop as well. The general idea of AMP is to avoid forcing a "rerender" of the DOM so it tries to do as much processing beforehand in order to only render the page once. This is why you have to specify the CSS inline and associate dimensions to each image.
Glad you liked it!