What you have described is (mostly) how Swedish society already works. Even the SAML part — we'll be forced to support eIDAS as of next month! Everyone residen

What you have described is (mostly) how Swedish society already works. Even the SAML part — we'll be forced to support eIDAS as of next month! Everyone resident in Sweden must be registered in the Swedish Population Register, and receives a personal identity number. Due to the Swedish constitution, information held by the government must be publicly available, so people's names, dates of birth, addresses and indeed identity numbers are not secret (though the last of these isn't on Google). This means that in order to prove your identity, people use ID cards and corresponding digital ID issued by the government and banks. Said digital ID is a passcode-protected certificate, either on a phone, a computer, or a physical ID card. The government doesn't have your DNA here though, although citizens' passports and ID cards contain fingerprint data.