The lockdown option on the lock screen only works for the moment you have the lock screen open. Once you close the lock screen and then press the power button again, biometrics become available again. What is the point of that? If I wanted to lock down my phone for the night while sleeping, the biometrics would be available within 10 seconds. You would have to keep the screen continuously on or keep locking the phone down every 15 seconds. An alternative is to restart the phone completely but who wants to do that every time they quickly want to lock their phone down. And if they have secure startup then it could mess with any alarms or notifications that may be needed.
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