Contactless is pervasive when there's counter service, but most POS systems in the US are still at a fixed staff station, and not one of the portable readers that the waiter can bring to the table. It's super weird, I agree (I was just in Guatemala, for example, and every restaurant had a portable reader they'd bring to the table), but I would imagine replacing POS systems again -- remember, we got chip card readers later than a lot of the rest of the world -- is annoying.