Is client-side rendering strictly necessary? Do your websites actually run offline?

I've built websites with React, used React Native -- none of it is necessary, nor the end-all-be-all. There's nothing truly novel going on. You can accomplish the exact same experience with server-side rendering and a tiny smattering of vanilla JS (you can use modern JS and polyfills and webpack/esbuild without React, you know).

For 99.9% of the web, I'd argue you don't need it. I have yet to encounter the 0.1% personally.

If you don't believe me, know that I'm not alone. Take a look at https://levels.io/deviance/ -- PHP and jQuery. What would React provide that isn't possible with his stack?

There is a disturbing amount of kool-aid being consumed around React/Vue/etc. Sure, you can slap together a website in record time with massive boilerplate/templates -- but so can I.