> Can you explain to me, how with an eID one would be prevented from communicating with anyone or buying food?

Some government (will) make mandatory: social accounts (so also IM apps like IG, WA, X, messanger), banks, buying simcard, internet, buying alcohol, cigarettes, energy drinks).

Some companies will make it mandatory implicitly or explicitly just for profit: selling your consumption data, analytics for themselves. E.g. in poland it's harder and harder to pay with cash because reduced stuff and huge queues - they force your use self checking. The pricing changed also that you have to use their loyalty apps if you don't want to be ripped - otherwise you will be paying 50% more.

> I would much prefer hotels would have a scanner which just transmits the bare minimum of identifiable information from the ID instead of it being completely normalized in many countries/hotels that they take your ID card and scan the full thing.

I don't like it either the problem is right now you mostly this being abused only in some hotels. Whats misleading that that this digital id won't allow tracking because you supposed to "trasmitting the bare minimum of identifiable information"