So if I am doing winter sports, I am going to have to take off my face protection rather than just taking off a glove? And if it's anything like Touch ID, I will have to have a face profile for day, night, winter, summer, dry, humid, shave day, non-shave day, good mood, bad mood, sunglasses, no sunglasses, etc. Oh but wait, I'm sure we'll be limited to five profiles.
Or worse yet, "Oh crap, I cut myself shaving,. Well, no phone today.
As Steve Jobs once said, I see this as a "Bag O' Hurt."