why would you unlock your phone if you're not going to look at it? I don't understand this argument.
I easily read any messages by glancing at the phone, never coming into any decent imaging range.
My phone can see the very corner of my head and about half of my eyebrow. I do not want that to be enough to unlock my phone.
Compare this to Touch ID, where you hold your phone to that box with your finger on the sensor and half a second later you've paid - very convenient.
I would take a guess that Apple has not yet tested any iPhone X with a European payment terminals and will get a lot of angry emails once people try that combination.