Perhaps I was too flippant. Point being, the “public availability/replicability” of the biometric would seem correlated to the point on the username->password

Perhaps I was too flippant. Point being, the “public availability/replicability” of the biometric would seem correlated to the point on the username->password continuum. This will probably matter less once our future devices can interact with our sci-fi personal nanites, or rfid implants in the meantime.