Well, it seems as though those of you who believed it failed for Craig were correct, and I was wrong. My initial take was based on an assumption that is incorrect. I believed that Face ID authentication worked the same as Touch ID authentication, with 5 failed attempts resulting in the passcode enable screen. This is false, as the
article posted today shows. FaceID only accepts 2 failed scans before requiring the passcode, and this is clearly what happened to Craig onstage yesterday. He then picked up a backup phone,
wiped his face twice, and proceeded - and authentication succeeded on the backup phone.
It seems that he was aware that it had failed, and believed it had to do with perspiration on his face (perhaps that causes a reflective glare that throws the IR sensors off or something.)
However - I've had Touch ID fail multiple times because my fingers had water on them. So, but systems seem to have these kinds of potential weaknesses...
So -
mea culpa. I was wrong. There are clearly some bugs to work out, and Apple knows that. Hopefully they're software solvable, and improvements can be made prior to the November launch.
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It's true that the Face ID demo fail took some serious luster off of the new tech. I initially thought it hadn't failed, and had only been set up improperly before the demo. But that's been shown to be false. He tried twice, and it failed both and then kicked him to the passcode screen. Then he did very clearly wipe his face twice - so perspiration does seem to be a factor.
That said - there've been plenty of times when TouchID has failed me due to moisture on my fingers, and I have to dry them off before it'll scan the prints accurately. So, there are shortcomings to both...