Yes BankID is the real MVP of digital systems, I heard some talks about the EU making one valid for the whole block. Hopefully it will fix all the countries.Everything is done through BankID in swedish-only institutions.

Put house on sale? bankid. Book a doctor appointment? bankid. Login to bank? Bankid. Open bank account? bankid. Sign contracts? bankid.

Heck I moved my pension (like a lot of money) to a different institution by just using BankID. Didn't have to call/email anyone, the process took 5 minutes (with about a month to actually process the transaction).