Verno wrote on Sep 13, 2017, 16:04:
TouchID is fast and efficient. What is the big improvement over that system?
Same thing with the removal of the home button, whether software or hardware.
I believe the rationale in both cases is to free up space on the front of the phone for an edge to edge screen. If I remember correctly, they were working on some sort of TouchID sensor embedded in the screen itself, but couldn't get it working well enough in time for launch, and as a result they fell back on face sensing as a compromise.