Then you've been selective about what you've bought. It's trivial to find devices that are Windows specific and/or have only gotten Linux and/or OS X support after extensive rounds of reverse engineering.
Low end printers and scanners in particular are notorious for skimping on the logic in the device itself and depending on a large blob of Windows driver code, with manufacturers that couldn't care less about supporting anything other than Windows.
Low end printers and scanners in particular are notorious for skimping on the logic in the device itself and depending on a large blob of Windows driver code, with manufacturers that couldn't care less about supporting anything other than Windows.