Comment by xb

The article talks about SPAs, but doesn't go so far as suggesting that an Ember or Angular app could be a separate project altogether from the rails app, requiring no integration with rails, using the back end only as a REST api and serving the static SPA from wherever (say a CDN). There are tradeoffs with this approach, but some would consider this even easier or simpler than having the html/js app 'integrated' with the back end.