My point is a user name is something everyone knows i.e. not a secret.
Biometrics are not a secret as they are, in the case of fingerprints - easily picked from your Starbucks coffee cup, the door you just opened etc.
Your face is permanently on display.
Etc.
Your assertion that biometrics are not user-name equivalent is embarrassingly ignorant and you've already shown your inability to read or show much comprehension.
I shall therefore assume that you're unused to rational discussion and leave it there.
It's so odd to me that we consider fingerprints "something you are". Fingerprints surely are "something I have" in that I can lose them by disfigurement or maiming. "Something I am" is more like my DNA which can't be taken from me to the point of loss, unlike someone cutting off my fingers which would deny me access to whatever system it's used for.