GNU/Linux supports more proprietary hardware than Windows or any other OS.
It does. We are working on libre hardware designs as well. Don't worry, we will get there eventually. Human life is about transitions; we evolve.
Your hardware isn't "proprietary" in the same sense as the software that runs on it. If you know what you're doing, nobody is stopping you from tinkering with your hardware.
Does it make sense to do not my left hand if I have cut my right hand?