Still waiting for VS Code to support Java 21. Java is not the language to use without an IDE.
I can't imagine doing Java in VS Code instead of Intellij. Is there something I'm missing out on?
No idea. I use IntelliJ for Java/Kotlin and emacs for everything else (Clojure, Python, JS, etc). I still encounter the occasional lunatic who uses eclipse or netbeans.

I know VSCode is the "standard" editor for front-end devs, and so I assume some of them are trying to keep their code editor when moving into backend work. I have to believe it's not as good - for a time I really, really tried to make emacs work for Java development, but it just.... doesn't :)

The reason I use VSCode is Code Server[0]. It is certainly not as powerful as IntelliJ, but the I have to get used to it because the web-based IDE is a must for me.

By the way, unless my English is terribly bad, calling someone lunatic for their choice of IDE may not be a great idea.

[0] https://github.com/coder/code-server