Not universally. I found usage of mobile order to b e more prevalent in Beijing vs nyc

99% of the restaurants I’ve been to in the US (and I live in California ) absolutely do not work that way. I’ve been to a grand total of one that does, and it was so annoying to everyone that they eventually stopped.

So now in the USA the waiter doesn't even bring you the menu and tell you order recommendations or the day's special? Are they still expecting you to give them 20% of tip/alms ?

25%. They don’t even bring you silverware or water literally only thing they do is bring food. It’s infuriating.

This depends on the restaurant or maybe the area. In Portland the restaurants with QR menus (using Toast) always seem to have a server that brings out water and periodically refills.

Don’t blame poor service on a QR code.

At least in NYC, no they don't.

I've seen that at a couple of spots, but the vast majority are just a link to a menu. You order through the server.

And even where I've seen ordering through your phone, it's was just an option for those who prefer it. Not the only, or even recommended, way.

I've only seen that a handful of times. Most of the time I feel lucky just to get a responsive website instead of a PDF that I have to zoom in to read.

Sometimes yes, sometimes no.