[Daycrawler]

The answers to the first difficulty are called "Universal Rendering" and "Isomorphic Rendering". Universal Rendering will render the page at any URL server-side, then the client will render other pages from there. Isomorphic Rendering is a special case of Universal Rendering in Node.js apps where the same JavaScript code is used to render pages in the client and the server.

Anyway, the article is right. Of course presenting users the current state of things in real time and allowing them to mutate this state in real time will always be harder than issuing requests to query the current state and requests to mutate the current state. It'll always be harder because it's way more complex and powerful from a user perspective.