Do we really need to define it? In America and Britain a sit down restaurant is defined as one where you are seated by a host and order via waitstaff.

I guess we do, because I am not familiar with that specific definition

What about those "sit down" places where you load up a QR code, order from that site, pay from that site, but have a server bring your food? are they still a "sit down" place?

Most would say no I'd guess in the US.

To me "sit down" implies you are seated by a host and waited on.

So a sit-down restaurant was a sit-down restaurant pre-COVID, then became not a sit-down restaurant during COVID just because the style of waiting/serving became different. That's a tilted definition

You seem to be trying to pick at words needlessly. Why does Covid matter now?

Because the same restaurant was considered a sit down joint and then it wasn’t because a QR code was used instead of whatever this requirement of needing a waiter to take your order. Do you not see how ridiculous that is. You came in, ordered food, someone cooked it, they brought it to you, you ate it while sitting down. You might have even ordered drinks too. You might have even done that with friends or family. How is that not a sit down place? Your definition is trivial and not really useful, but sure, it’s me needlessly being picky with words

What are you even going on about? QR codes make no real difference. Though in America I have not seen many great implementations and I would guess many would be fast food or fast casual. It’s the level of service being provided. It implies you are spending time eating with a level of service being provided. Weird

Typically I don’t think we need to define when it’s fairly standard terminology. Kind of like having to define something that’s in a dictionary. Though understandable if you are not from the US. This wiki which was top of google may help you though. https://en.m.wikipedia.org/wiki/Types_of_restaurant

You may be overthinking this way too hard. It’s simply the level of service being received. There are some definite shades of gray here but throwing qr codes into the mix is pedantic. You could have fast food QR code ordering, fast casual and even sit down experiences. The QR code does not really factor too much into it.