Here in Norway (and probably Sweden, too) BankID is a widely used authentication system, and most domestic services will use that as a auth / login. Only "drawback" is that it requires 2FA, which is quite trivial today. But there are still tons of users that want their "login with FB / Google / etc.".
And a last but: If using such auth systems, one would have to account for all the different systems unique to countries.
Maybe some larger EU-specific ID / auth system would make sense?
BankID is very convenient but the lock in is ridiculous. Owned by a private company and pretty much every service that you use depends on it. You're forced to own a new Google-approved Android or iPhone to use it and to function in society.
We definitely need a vendor independent ID system.
Many European countries have decent authentication, banking and payment system alternatives or even innovative solutions. I think, like usually, it's just a problem to break out of national or regional circles into something pan-European.
A lot of people seem to agree that relying on a handful of too powerful American companies, especially in the ad and social media space, is a terrible idea and running foul of privacy requirements. Remains to be seen if some larger alternatives manage to pop up though. The European landscape is pretty fragmented.
Sounds like the EU Digital Identity Wallet project: https://ec.europa.eu/digital-building-blocks/sites/spaces/EU...