I don't expect a restaurant owner to entertain me, but I do expect them to be able to tell me what is in a dish, suggest a suitable equivalent if the restaurant doesn't have exactly what I'm looking for, tell me what's good or fresh that day or bring me something with more or less spicy depending on my preference. Any of these very short and simple interactions about exactly the product they are selling are much easier to have in person than trying to express every possible branch of a back-and-forth conversation in a tiny text box on your phone - and that's assuming there even is a text box.
I've walked out of several restaurants where they had real humans "serving" who either were completely ignorant about the food they had on offer or too lazy to bother engaging with a potential customer. "Just check the app." (Which doesn't have the answers.) What's the point, then? If all you care about is talking to your friends and not getting restaurant service, then just order online from a delivery service and enjoy your meal with friends in the park, in a square, in your office kitchen, in a hotel room, at home, wherever.
And please don't think I'm asking for American style "service" where you practically have servers begging you for tips every 2 seconds. There is a comfortable middle ground, and pretty much every small restaurant and da pai dang in China does it perfectly fine without a QR code menu.