> It doesn’t get the full features but it’s functional as a gamepad at least

So it’s the controller and not Windows then, if partial functionality is okay (which seems fine to me).

For the OG controller on Linux, it was/is possible to use third-party open source software like "sc-controller" to map the pads and rebind things the way Steam does, without needing Steam running.

I don't have any reason to believe that similar projects won't work for the new version.

Not really, just things that haven't been implemented in drivers yet.