Well, no. By definition it has to see your face. If it can see your face you can see it first, and at that point it isn't unlocked. By default you also have to swipe up after unlocking. That is even more work.

One common use case for me is handing it to my passenger while driving. Face id would require me to put it in my fov, which counts as distracted driving. With touchid it unlocks as I slide it out of my pocket.