Just use React or something, you can use a single syntax for all three. It makes total sense why the syntax is different if you think about when and why they were made. We had HTML for years before CSS, and it was longer still until we got JavaScript. Each language has a different purpose, so naturally a different syntax makes sense. Your hill is poorly defended.
Idk, I like CSS, but I come from a web development background. Modern JS (ES4+) is fully capable of replacing CSS using the style property.
JSX is sort of like a singular language to do all three.
HTML isn’t perfect, but I can’t think of a better language for writing documents. TEX is unintuitive, PDF is opaque, markdown is just HTML shorthand.