There are many ways to answer this question. My top answer is that this is an advancement that does not need to be immediately applicable to anything to be valuable. Add this to your list of things that you didn't think could be done and draw inspiration from it.

My second answer: It's portable in the sense that I can fit it in my bag. Do I also want to put a Linux mini-pc in there when I'm already carrying my iPad?

My third answer: This is also a nice demonstration of the ridiculous user space things you can do with driverkit. This can motivate people to do other nice things with other hardware that is more portable, or use Linux drivers with driverkit on their mac mini (say).