> there are clear and concrete metrics that tell the story of large improvements to service
Covid is the most disrupting global event of the recent human history I bet it had a quite larger impact than a simple QR code, assuming what you say it's true.
> You're hyper focused on the ideal situation
Am I? I know that for a diner to serve me at a table it can't take less than 20-30 minutes or I am eating literal dog shit and I honestly don't like dog shit, regardless of the service I am receiving (or worse: I am making the staff uncomfortable by asking them to be quick because I am the one who's in a hurry).
It means in total it will take at least one hour, if I don't have that time available I simply do not sit down in a diner.
It's as simple as that, the ideal condition it's a dinner that usually takes from 2 to 4 hours.
The 10 seconds saved on a QR code assuming that the QR code really saves time it's irrelevant at that point.
It is possible that different cultures have different ways of understanding 'service standards'.
> expectation of the tip
You're hyper focused on your own bubble, in most of the World tips are not mandatory nor common especially for a quick lunch break.
And still your answers do not address the larger picture: the staff is there to help you, not to serve you in the as a servant way. They shouldn't, in my opinion, be considered like minions executing what the machine told them to do. That's what Fritz Lang warned us about in 1927.
But even assuming that the QR code saves a lot of time, good staff can go a long way, a fast self-service order system where you wait at the table because the place is understaffed it's a worse experience than an understaffed place where at least a real human greets me asking what I want to drink, before taking my order.