I beg to differ, having designed computers for many years. All you need is a camera that has a data path to the main processor (CPU) and you can use facial recognition software to unlock a Macbook. PCs have been doing this for years without anything more. Given Macbook can support video conferencing/FaceTime, then all the hardware ingredients already exist inside a Macbook. At this point, it is just a matter of having the right software running on the Intel processor. And, I guarantee that the Intel Skylake/Kaby Lake processor has more horsepower to run facial recognition software than the A11 processor that is in the iPhone X...by perhaps an order of magnitude more powerful.