Solid JS is what I would have chosen. Not sure if they considered it. Best performance and dev experience with least 'magic' of all frameworks I've tried.
Solid does have state management. Its state management primitives can be used outside components and can even be used completely on their own, and its stores are fairly similar to Svelte stores.
They recently released a beta of SolidStart, their answer to Next.js/SvelteKit/Remix, etc, and I’ve been really liking it. A lot of good ideas pulled from the other frameworks. https://www.solidjs.com/blog/introducing-solidstart
wild west? as far as CSS is concerned the cascade should be well known and for scoping its (in order of preference):
1. user
2. client
3. document
and within document its in "components", but those are unknown from the start so we defer the details (which must not but can lead to "wild west"). programming is hard, thought. would love to have that holy grail solved, too (apart from the famous three column layout).