[vatotemking]

What do you mean by "passwords can be revoked"? I only have one fingerprint and unlike usernames, it cannot be changed. Once an attacker gets hold of my fingerprint i can no longer use it. (This is an honest question btw).

[dpark]

A changed password is revoked. You revoke the old password when you create a new one. So passwords support revocation whereas fingerprints do not. The question posed above is whether the inability to revoke (or change) a fingerprint matters.