On: iPhone Duo

[urbandw311er]

This is likely a technical limitation rather than a preference; with the requirement to be so thin, there is probably not enough room for the necessary depth scanning hardware required for Face ID.

[user43928 → urbandw311er]

The reason they gave was that with TouchID it can be unlocked consistently both when folded or unfolded.

For FaceID they would need to include that hardware twice, also under the display in the inner screen.