So, they should all just rotate their voices ... right?

I jest but the majority of the "normal" people I know are happy to hand over biometrics because _it's easier_. We need to start branding biometrics as "forever passwords" or something to help people understand just what they're handing over when they validate access to their checking account or enter Disney World or whatever else.

Functionally, biometrics are closer to a username than a password.

Fingerprints, DNA, iris scans, gait patterns, etc. are all something you can't change (much like a permanent account ID) and are constantly being presented to the world (much like an email address). In addition under US law, police can compel presentation of fingerprints, but passwords are protected under the 5th amendment.