It was and is a reality for many people and was my very frustrating reality for quite a while. The concept of "client-side only" code that does anything more si

It was and is a reality for many people and was my very frustrating reality for quite a while. The concept of "client-side only" code that does anything more significant than animations (such as, say, modals) breaks down if you want deep linking, and deep linking requires full data reloading on every action, because how can you be sure the data is all there if you don't load it, and once you're reloading your entire state tree on every action you're already slower (not just in data transfer but in code execution) than the "traditional" client-server pattern, and if you have a UX team and any timeline pressure at all, you've already written yourself into several corners for UI bells and whistles, which unfortunately affect the server side as well now, not to mention being at least a major version out of date on several NPM libraries, and just another rewrite away from clean architecture, and so on...