People do not use 'most printers and scanners'. They want to use that one printer/scanner thing they recently bought, and has only printer drivers available for Linux on the manufacturer's page.

Had a problem with this quite recently, and solved it by buying a new device. And, since, as you said, a lot of them work on Linux with minimal setup needed, I was able to buy it without any issues. But this does not mean that the problem does not exist.