You can't be more wrong. You're saying that only logic performed on the client side can be considered an application? State can be stored in the server. Screen changes can be done by loading html, it doesn't need a framework. React is far from crucial for web development, but people haven't learned anything else the last decade. Most front end developers these days don't even know what a template engine is, and some don't even know how to create a website without a backend rest api that spews json data.
I wasn't comparing SSR to non-SSR (Server Side Rendering). As long as you can refresh portions of a webpage (or states of GUI elements), after a user action (button click or whatever), that's fine.
However the reason my Dialog Boxes open in a millisecond, and close in a millisecond too, is because I choose to render them locally. I'm not against SSR tho, as a viable concept. That's a different complex discussion where there are trade-offs to consider.
