title: Why doesn't Google's AMP-html allow at least one external CSS file?
body: <p>It seems to me that having a shared CSS files across multiple pages that can be cached by the browser would be a benefit to the user experience.  There comes a point where 1 additional connection on the first load is worth the savings as the user navigates through your site.</p>
  
  <p>I can't find any information that explains why this isn't the case now or why the AMP team choose such a seemingly extreme rule in this case</p>