Many EU countries already issue a chipcard IDs which can be used to auth for government services (via NFC or a dedicated reader).

So yeah, I'd expect those to move to a phone as an alternative to the card

This is not the same. For instance, we can access the internet without needing that ID. But right now there are attempts to force a digital ID in order to access information on the www - this is the whole idea behind "age verification". The kids are just used as excuse here. It has never been about the kids.