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If you're detained or mugged you have other problems to worry about. They can also threaten you with a knife to get your pin code or put your fingerprints on the phone. If anything face ID requires your eyes to be open, they can knock you out and use your fingerprints more easily.

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Law enforcement in most developed countries won't resort to violence to get your credentials but are happy to point your phone at your face.

By the "they can just use violence" logic, no computer is secure and we should throw them all into the ocean. Security can improve the intermediate cases- focusing solely on the worst case is unproductive.

They can also enforce you to use your fingerprint or face (in The Netherlands) but not PIN or password (in The Netherlands), both with proper (minimal) force. In UK, there's a law to force a user to give away their password. Which, IMO, is the same as being enforced to help your own conviction.

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