A thief flags you down, grabs your phone and makes you unlock it using your thumb.
A cop opens the cop car door, grabs your hand and unlocks your phone, or even easier, face unlock.
Granted, guns and torture are rather effective as well, but is anyone entirely against fingerprint unlocking?
If I can’t change it once it gets breached (because it will get breached), then it’s not security, it’s a hurdle at best. Biometrics entry isn’t security; it’s convenience.