What I mean is - whatever is driving your graphics card, monitors and local network. Sometimes I do a dist upgrade and my video drivers go to junk. Or family install something to my workstation and I find that it has added junk to the boot sector, and I want to get rid of it for sure. Or my mac laptop just starts being really slow for reasons I can't be bothered to investigate. These things are no longer an issue because your desktop install is expendable.