> But then they have to remember the username AND the password? The commenter already acknowledged that the solution has drawbacks. The only claim made was tha

> But then they have to remember the username AND the password? The commenter already acknowledged that the solution has drawbacks. The only claim made was that it solves credential stuffing, not that it doesn't inconvenience the user. > This would only work for those with a password manager It would also work for those without a password manager, because they'd have no choice. > Also, wouldn't this prevent lost password recovery? if you can't identify a user by their email? They're not mutually exclusive. You can have both. A compulsory unique user ID to login, and an email based password recovery mechanism.