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).
I'm just always surprised when people place their entire phone over the code, thinking it needs to fill the screen, when they scan pretty well from a couple feet away.