Excuse me, but this is ridiculously easier than forcing someone to use their fingerprint; just wait until they are distracted, show them the phone and ask them "what is this?". It unlocks in less than a second with "Require Attention" activated. We prank each other this way when we forget our phones around the house.
* If you're concerned about someone who can see you typing, a biometric is better because they have far fewer chances to watch you — especially if you don't reboot outside of your home.
* If you're concerned about actual adoption, a biometric is better because you remove the constant frictional password entry cost which causes a large fraction of users to use short, easily-entered passwords.
* If you're concerned about someone who has enough access to construct a usable fingerprint / face facsimile but can't coerce you into providing a password or shoulder-surf it with a drone, a long password is better.
Much easier to force someone to unlock the phone with their fingerprint than to force them to unlock with faceid if you have “Require attention” on.
You can’t physically force someone to look in a certain direction, but you definitely can force them to tap their finger on a surface.