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Sorry, it’s not. Face ID: Just pick up your phone and your phone automatically unlocks with your face. This experience is way superior than having to position your finger at a specific place every time you want to unlock it. Putting it on the back is even worse, you need to actually pick up your phone from the desk just to unlock it. I swear HN readers would create devices with the worst UX possible.
If you haven’t unlocked your phone by the time you’re looking at it you’re doing it slower than I am. Typically my phone is unlocked before I’ve even fully pulled it out of my pocket. The muscle memory for thumb (or finger placement if it’s on the back) is a pretty low barrier to usability, and can be learned quickly. Can you unlock your phone without moving it in front of your face? I can, if it’s sitting across my…
Counterpoint: with Face ID, if my phone is facing me I can interact with it just by looking in its direction.
Got a message while I'm at my desk? I look at it, it unlocks and shows me the notification. Cooking and a timer goes off? I look at it, it lowers the volume of the alarm.
Everything has trade-offs and different people use stuff in different ways, but I personally prefer Face ID to Touch ID.