Twitter is ditching client-side rendering and moving back to server-side. Does this mean client-side rendering is bad? Should we also move back to server-side? Well, it's insane to have FUD on client-side rendering just because it didn't work for Twitter (remember Rails can't scale?). Rather, make it a lesson on how to use client-side rendering sensibly.
In an essence, this was the problem. When serving a web request, it's important to get the most essential information quickly before users' eyes. Best way to achieve this would be to identify and render the essential blocks in the server itself. You can then delegate the rest to be rendered on the client.
On most instances, users come to Home screen only to proceed to another action such as create invoice or add time entry. By rendering navigation blocks on server, we allow them to do this action immediately. Since remaining blocks are also rendered progressively, users can start interacting without having to wait till everything is loaded.
So if used properly, client-side rendering can actually improve the overall user experience. Rather than trying to do everything in server-side or client-side, figure out how you can have the best in the both worlds.