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> The rest of the industry seems to be moving towards under-screen ultrasonic fingerprint readers, which if Apple adopted, would allow them to shrink the notch by getting rid of the Face ID sensors. I think they've dug in their heels on Face ID though, so it likely won't happen (although they did reverse course on Force Touch, so anything is possible).

Or they could have both Touch- and FaceID. ¯\_(ツ)_/¯

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They definitely could, but it would likely cost Apple more to have two sets of sensors, not to mention take up more space in the device itself. Isn't that how they justified removing the headphone jack? And of course this is Apple we're talking about — they would probably deem having two authentication methods to be too confusing for users. They only recently decided to allow things like arbitrary home screen icon re-arrangements in iOS 18.

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