What if you want to have more than one account with a provider, but you have only one face?
Are you serious or are you being pedantic and trolling? That doesn’t change my point, your face shouldn’t be the password to both accounts. It’s pretty easy to add another step for multiple accounts.
Biometrics should be usernames, not passwords. Fingerprints, irises, faces, vocal patterns, all of it, no matter how good it is, only identifies the person trying to enter/use something and is somewhat easy to steal without their knowledge.
If you want true security you still need to ask for a passcode that only the now-identified user will know.
And yes, it is still possible to intercept the passcode at the moment that the user interacts with the locking mechanism, but that is completely different from grabbing it when they’re randomly walking down the street, etc.
(Edit to add: I didn’t think this needed to be explained, but I’m not saying biometrics should replace usernames, I’m saying they shouldn’t have replaced passwords. And yes, you can still use biometrics in the authentication process to identify that it’s you, i.e. your username, but you still need a password.)
I’m not saying biometrics should replace all usernames. I’m saying that they should be used as usernames/identification at best.