JSX (and components) is possibly the nicest templating language I’ve ever used. The problem with almost all others is that they are based on strings, so you lose type-safety (and more importantly completions) for the template parameters.

However, the current ecosystem makes it really hard to use JSX for just templating. There are libraries that do exactly that, but you end up wanting compatibility with React, because there are a ton of pre-made components that basically output only HTML (for my use case, react-fontawesome), which you miss out on by using a different library.

I haven’t used Svelte (but I’ve given it a brief look), so some of these might be wrong.

Scoped CSS is nice but not a necessity by any means (I use Tailwind). Svelte is very restrictive, as it basically forces 1 component per file. Svelte also introduces new syntax to to handle conditional HTML and iterated HTML, which I personally don’t like. With JSX, everything is just Typescript. I’m a bit torn on slots, but I think I prefer JSX’s everything is a prop approach.