But do any of these address the point that effectively anyone in a developped country already has one or more unique IDs of some kind ?

And for any developping country, time will come where people who don’t have an ID now will need to get one, to receive care, go to school, get out of the country or drive a car.

In that sense, if a country allows people to not have a surname, as long as they have at least one canonical ID I guess it’s fine.