Doesn't strike me as wise. Your phone is always on you, if you have a biometrics killswitch you're better off than repeatedly entering your password, day in and day out, in public locations where a highly motivated actor WILL be able to figure out your password with mere binoculars and two or three observations.
This is why I hate when I get a 1Password prompt to reenter my nonbio password at inopportune times in a public place. My keystrokes can be secretly filmed from a distance. When I gain access to passwords that I copy and paste by fingerprint, the forcible theft of my machine puts me at near 0 risk. (My preferred way to login while in public.)
You are not leaving fingerprints on your device? Btw. there have been successful unlocks of biometric sensors using photographs of fingers, so you better wear gloves all the time.
Reminder to iPhone users that five fast presses of the side button will pop up the emergency calling page; it will also lock your phone in a way that requires your passcode to unlock even if you use biometrics.
Know how to disable it immediately. On Graphene and many Android phones, holding down the power button will reboot it with pin required to complete start up.
