Actually, I agree with Professor Ahmed Ghappour. There are now a few countries that might require you to unlock your phone when entering the country, for example Australia.
Edit - Yes, based on the bill you could face jail anyway if you don't personally unlock it. However, at least you'd have more control over the decision. This is also important for those countries that would like to look into your phone due to 'suspicious behaviour' but is a legally grey area.
https://nakedsecurity.sophos.com/20...ock-their-phones-could-face-10-years-in-jail/
With FaceID, if the customs agent has it, then it would be much easier to 'accidentally' point your phone at your face. This could also apply to a police investigation (covertly while interviewed) and a cyber-criminal (stealing your phone, covertly or overtly, pointing it at your face before running off). Yes, the former examples could be classed as illegal, however, if done covertly, the user wouldn't know about it. This is especially the case for those who are an IT-novice.
Fingerprints will nearly always require a more invasive and physical strategy, therefore, making it harder to unlock.
Disclaimer - This isn't a political post, nor is it intending to be one.