Hello? Who are you?
From the linked MS twaddle: I’d like to introduce you to Windows Hello – biometric authentication which can provide instant access to your Windows 10 devices. With Windows Hello, you’ll be able to just show your face, or touch your finger, to new devices running Windows 10 and be immediately recognized. And not only is Windows Hello more convenient than typing a password—it’s more secure!
Your face and other biometric measurements should replace your UID, not your password. Your face should intuitively be recognized as a representation of who you are, which should not be enough to gain access to any system. It is not more secure than a password, but it is tons more convenient... right up until that time you get punched in the face and have your fingers stomped on for putting out such a load of BS. I didn't see anywhere that there was a backup method for authentication. It looks as though once you are out, you are out, at least until you can regrow the missing parts just like the originals.