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The difference is that it's easy to change a PIN, but hard to retrain FaceID. So sharing a PIN is reasonable in the knowledge that it can be changed, but you might not be aware that it has more ramifications under opaque and unclear circumstances.

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Retraining FaceID takes about 20 seconds. How is that hard?

The hardest part might be noticing in the first place that your FaceID model has drifted away from only your face.

That's the thing, though... it would only drift from your face if the face it was drifting too looked similarly enough to your own.

I assume changing the PIN forces a FaceID reset?

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