You are right that VS Code has a "nicer" out of the box UX (this is subjective of course), but Emacs offers a malleable environment. In VS Code, you are limited to what the APIs the developers decided to expose. If you want a specific behavior that isn't supported, you either fork the editor or create a feature request ticket and wait for someone to prioritize it. In Emacs, because you have full access to the internal runtime, you can implement that feature yourself in a couple of lines of Lisp.
Emacs might be a solid editor choice but my intuition is that it probably won't be worth it for the same reason LiteXL wasn't for me. If I do work on adding features to my editor I think I'd be more comfortable doing it in js, html and css. And if possible I'd rather start with a base that's mostly where I want it to be. Trying to turn emacs into vscode sounds like way more of a project than turning Theia or CodeMirror into vscode.
https://github.com/DevelopmentCool2449/visual-emacs
Which didn't really impress me terribly much.