At least for JavaScript, it seems like it still doesn't support Inline Variable. I can Extract Variable, but not Inline. Of course, that's a different matter than whether it's supported for Java. Last time I tried using the Java extensions for a non-trivial Spring Boot project, it was intolerably slow. I managed to convince a coworker to switch to IntelliJ after he saw the difference between my setup with IntelliJ and his with VS Code.