Hacker News new | ask | show | jobs
by somethingAlex 1507 days ago
Fundamentally, if you want to support multiple, unlinked accounts per person you'll still need some sort of "account designator."

If you don't then the biometric marker can just replace both password and username. The reason why the username exists for the password is because it's problematic to guarantee uniqueness of passwords across your users. One is unique and public and the other is not and private.