Adding my voice to the hardware compatibility issue. While most hardware just works, Linux usually lacks the ability to configure the device. Audio interfaces are a good example of this. They work but you can’t set the sample rate or enable any custom features on ANY of them.

I believe government regulators should step in and require hardware manufacturers to provide Linux support equal to Windows or Mac. This could be relaxed for low volume or highly specialised devices, but mainstream consumer stuff should be more universal.