The problem here is that it wouldn't matter if you made a better language for styling web pages, because you have no vector to get that language included in browsers; and even if you did it would take years for it to get enough market penetration for you to rely on it as something you can deliver an app in. So, you'd end up with some horrendous compatibility layer that compiles everything down to nasty CSS anyway.

Same problem with Javascript. Here we are compiling Typescript down into it... and running JS on the server with Node in order to avoid the classic impedance mismatch we all had back in the day writing backends in PHP etc.

Feels like the real solution would be to allow browsers to become more flexible with language implementations instead so we can make more progress. WASM might be the ticket there?