Is there still a use case for this VSCode Extension?

I can't make meaningful contributions to this package, but I am able to make the builtin support for CSS in VSCode itself better.

Are there still things this extension does that make it useful?

I can only currently think of two things :
- syntax support for `@custom-media`
- syntax support for `@custom-selector`

If there is anything else, please let me know so that I can investigate what can be done in VSCode itself.