Again, biometrics are fine for local access. If you cut your finger or scar your face just use your backup method (maybe a pin, maybe a different finger) to get

Again, biometrics are fine for local access. If you cut your finger or scar your face just use your backup method (maybe a pin, maybe a different finger) to get in and update the scan. And if someone steals your fingerprint they can't use it without having physical access to your device, because again, this is for local access. For remote authentication you use a private key accessed via the local system (which you are already authenticated to using biometrics).