I unlock the phone while it's still in my pocket, by the time it reaches eye level, it's already unlocked. And with a few muscles memory tricks, there's even a chance I have opened the right app without even looking in the fraction of a second it took me to take the phone out of my pocket.

my phone is currently sat on my desk, about 10 inches from my right arm. I can, and do, check messages on it, by only repositioning my arm to unlock it.

I easily read any messages by glancing at the phone, never coming into any decent imaging range.

One reason would be ApplePay. At least in Europe most payment terminals have their NFC sensors on their side, so you're supposed to hold your phone flat with the side of a box, so the selfie camera just points to the wall on your left. In that position, there is no way that the camera of your iPhone could see your face.

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.