alt Hacker News> React/Vue/etc solve a specific problem: single-page application
That's not true. They solve the problem of requiring separate code paths for interactive elements - one for initial render and another for updates.
Previously the server rendered the initial HTML and then client JS updated it after e.g. user clicks a button, but with React/Vue/etc., it's merged into one code path because HTML is derived from the current state.
> Even multi billion companies hiring leetcode ninjas can't get acceptable user experience
Modern UX is bad because many front-end programmers fundamentally just do not care about the UX, it's not about the specific tech they use.
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Only react "solves" that. In vue component setup only runs during mount. Update is not a thing in the way react has it.
> A Single-Page Application (SPA) is a web application or website that loads a single HTML page and dynamically updates its content as users interact with it, rather than loading entire new pages from the server.
That's the definition, I didn't made it up.
And those libraries solve that.
Your other definition, can be fully implemented server side, Elixir's Phoenix does that. But it's not the only one.
> Modern UX is bad because many front-end programmers fundamentally just do not care about the UX, it's not about the specific tech they use.
This is untrue and is weird misunderstanding on your part. Most of modern UX and UI is designed to fit the needs of the customer for the frontend team/dev: the product or marketing or sales department. The user of the website is very rarely the customer for the dev.