This article doesn't land for me. The author complains about having to scan the code in sequence, but overlooks the fact that a waiter/waitress/till can only serve one person at time. And as you say, multiple people can scan a QR code, _and_ it would be trivial to print more.

Maybe I missed the point, but the aside about parking metres seems irrelevant. Just makes me think this is an anti-technology rant.

And again, the gripe about splitting up the bill. Not only is that a problem with existing systems, it's a problem that is solved by QR codes (if implemented correctly).