Because, while most of us think of FaceID as a simple way to unlock our phones, FaceID is a serious 3D-tracking technology. It projects thousands of points of invisible light to map your face's unique shape, with so much accuracy that Apple says someone else passing for you is less than a-once-in-a-million chance.
But Apple seems to be solving for potential sizing issues in about as accurate and seamless a way, bar having to come into a store to be personally fitted. It reminds me of how retailers have experimented with virtual sizing through both cameras and AR.
Scanning your body is still an awkward, self-conscious practice to take part in, and even a high-fidelity sizing doesn't mean that a bunch of third-party clothing companies are making garments that actually fit your unique morphology! Still, in the case of Vision Pro, Apple is linking a behavior every customer knows (too well!) with its technology.
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