I think this is more about making it easier to run the Unity editor headless in a docker container than it is about making lives easier for those extreme few wh

I think this is more about making it easier to run the Unity editor headless in a docker container than it is about making lives easier for those extreme few who actually want to use the editor within Linux. Linux users often choose Linux because it is open. The Unity editor is definitely not open. That's an educated guess, not something I know for a fact, and it makes sense given what I know about how the tool has evolved. Unity has been able to produce games that run on Linux for a long, long time, so Linux is making some headway, you're right.