So yeah, unless the 10 is super advanced and knows how my facial hair grows on a weekly basis, I'm not convinced. Im still not convinced about the finger print lock.
Touch ID, or really just fingerprint biometrics in general, is probably the safest and fastest way to secure and unlock your device. Touch ID (and so will face ID) is even used in first and third party software for authentication. Apple Pay auths through Touch ID. When I log in or buy stuff from Amazon, I use Touch ID to auth. When I access my bank account on my phone, I use Touch ID. The auth process is so fast and easy, there's no reason to use a pin or password. You can't unlock your phone while you're still pulling it out with a regular pin. It's that fast and easy.