In my country (Denmark) every person and legal entity has a government-issued digital identity (NemID) so the authentication process is trivial and cheap.
The provider of the system is being replaced, which means that NemID will be replaced with MitID. This solves some security issues, but brings others. Most importantly, MitID, unlike NemID, does not allow the service provider to embed the login form, but always sends you to the identity provider to log in. On the other hand, you no longer need to input both a password and use a second factor (key card, code generator or phone app). In MitID, it is enough to enter your username and approve in the phone app. This is quite bad, and has led to the comical recommendation that you should pick a username that is hard to guess. Comical because the main argument for not requiring a password is to make the system easier to use, because passwords are hard to remember.
Probably need to call the Estonians
Same in the Netherlands with DigiD. The name is an awful pun. Very Dutch.