I believe that this is a topic for many makers, not only Apple.
I was thinking that devices like the iPhone X are defining dedicated use cases.
As you pointed out, is quite clear that we don't use the full capacity of our devices (like we don't use the full capacity of our brains and our bodies) and this will not stop makers from adding new features to their products.
What, I believe, is the most important topic is related to the basic features you need from that device. And I am thinking to all the range of people not only the ones that are familiar with a touch interface, double taps and shortcuts.
as @nalindeabrew pointed out, the new unlock system is disruptive compared to the TouchID. My gut says that the FaceID requires a higher learning curve in terms of gestures.
I am, also, very curious to see the limitations of such system. With the TouchID we were blocked when our hands get wet or when we were wearing gloves and I can't imagine how we will unlock the iPhone X during a running session wearing a hoody, or while we are skiing.