Absolutely agree with Ron Amadeo on this one.

Originally shared by Andreas Proschofsky

Absolutely agree with Ron Amadeo on this one. No matter how technically impressive Apple's implementation of Face ID might be, it's still inherently a less reliable and slower alternative to using a fingerprint sensor. And as it also carries all the same problematic properties as a biometric form of authentication (tl;dr: you only have one face, so if Face ID is compromised, you will never be able to change it, also you can easily be forced to unlock a device with your face) it's not even an improvement in that respect.
So let's not be fooled by Apple's announcement: The real reason they did this is because they couldn't get the fingerprint sensor in the display working in time for the iPhone X - that's it. (similiar to the situation around the Samsung S8/Note8)
https://arstechnica.com/gadgets/2017/09/face-id-on-the-iphone-x-is-probably-going-to-suck/