Also remember, in the USA, the police can legally force your finger onto a reader to defeat the lock, without violating your 5th Amendment right against self-incrimination.
Remember (on an iPhone) you can squeeze the power button and one of the volume keys for a few seconds. This disables biometric authentication until a passcode is entered.
This can protect you against this "attack vector".
It can protect you, but as I experienced, if you have your phone in your pocket and a government agent puts a loaded gun to your head and tells you not to move then you can't access this feature...