Here in some European countries, like France, having a smartphone out in a restaurant is a sign of bad etiquette. It's not crucial, but from some people's perspective it might seem out of place. However, some restaurants tried QR code menus due to COVID-19, but most of them have since stopped using them.

I fully agree that having the latest version of a phone/OS should not be treated as a requirement for access to services, especially essential ones.