Are you suggesting to make a uv/ruff/ty but for Java?
Additional tooling that matches the functionality of uv/ruff/ty would be nice, as it would allow you to develop Java on not just an IDE (IntelliJ) but in something like nvim (it isn't impossible, just not as good).
Decoupling this is obviously not in JetBrains interest, and it seems like there isn't much will in the Java community to break away from the IDE-centric development.