You gotta love that little finger swipe action. I wonder what IBM are doing with your fingerprint gif?Thinkpads et al have had this feature for ten years. By nice if Apple brings Touch ID to mac hardware too.
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Of course it makes it easier. But that doesn't mean putting a sensor on the keyboard wouldn't be better. But then why not use the iSight camera in conjunction with voice recognition to get access. Both sensors are already available on all macs and all iPads and iPhones.
Not a great idea if you've ever recorded your voice in public and/or posted a picture of yourself on public media.