I know, and respect, many of the authors. As a W3C TAG member, I helped write our Distributed and Syndicated Content Finding (see also the blog post), so some of the points raised there are things I care a great deal about.
Specifically, I think it's important for federation not to break origins and URLs. Apple and Facebook do this implicitly with their news products, which stinks. AMP has too, but they've stayed cloer to the web. I'm hugely excited to see their commitment to the emerging Web Packaging spec to heal the URL problem: amphtml.wordpress.com/2018/01/09/improving-urls-f…