I also suspect you are out of touch. QR code menus and payments were not a thing in the US before the beginning of 2020 either. It was a very quick adaptation because the infrastructure was already there.
Your observation is correct: Many germans like to stay in an restaurant es an event, not just to eat something quick ... for this purpose there are tons of Pommesbuden, bakerys or Dönerläden.
Is that something that very much depends on the region, or a personal obligation? I've eaten in restaurants in Hamburg, Berlin and Munich during pandemic (summertime last year until about November, and since June this year). Eating this year has been limited to outdoors, but that's fine.
(None have had this crazy QR code link menu idea. I have always received a traditional menu and ordered by asking the staff what I want at the appropriate time.)
Its a personal obligation: My wife and i, we life in the same building as my older parents (in a big old half-timbered farmhouse)... so, until now (both parents are vaccinated, my wife got her second shot yesterday and i will get it soon) we were careful...
I'd lived in North America for a long time by then (left Germany when I was 13) and initially this seemed a bit strange, but you get used to it. Eating as a social occasion where you might even meet interesting people.
All before COVID of course.
Cultural difference. If you don't want to spend time with your friends then don't accept invitations of going to a restaurant.