Dec 17, 2017

We do this as well, except now my wife just grabs my phone and points it at my face in the car to unlock rather than use the passcode. This works pretty easily if you have the “attention detection” feature turned off.

Not arguing this is ideal, but it works and avoids retrains, although Apple have publicly stated retrains only occur if they believe the face matches above a base threshold, which makes it much less likely a female face will retrain on a male Face ID user’s phone, and vice versa. It doesn’t retrain on every passcode entry.

Nov 16, 2017

False positives via family members is a documented shortcoming of the technology.

Nov 13, 2017

No, Face ID takes another snapshot after the passcode has been entered.

Source: "Face ID takes another capture and augments its enrolled Face ID data"

Sep 27, 2017

Impressive to see a detailed page dedicated to affirming privacy as a "right". One of my first thoughts was, "it'd be nice to see a white paper" -- which Apple does when you get to the bottom of the "Approach to Privacy" page (linked to from the submitted URL):

There's a link to an iOS security white paper that was published in March 2017. And there's one for FaceID. Not sure how if any of the info was previously unknown, but the paper's publish date is September 2017: