But that's assuming everyone brings their phone along everywhere and not everyone knows how to scan a QR code or even (think elderly people, for example) owns a smartphone.
I do agree that it's more sanitary, though. I did go to a place a while ago that had a QR code on the table which I thought was really cool, actually. Because it allowed me to place my order on my phone and even pay on my phone. But they offered a physical menu as well.
That must've been an expensive phone call. I hate when they leave you waiting for ages and then charge extra even though it's wasting your time, not theirs.