I know there was extensive testing when face recognition authentication came to smartphones. I wonder how an open source project like this one compares. I suspect there are substantially more false positives/negatives than on a commercially developed version that needs to support everyone to be successful.
Apple's Face ID uses what is essentially a 3D camera, a simple 2D color camera cannot compare to that in terms of accuracy.
Apple has clearly done a lot of work in this space and have decided to retain Touch ID on Macbooks. I think this is fairly instructive.
That was primarily because the face id sensor stack is too thick to fit in the laptop lid
The point being that they think they need those sensors in order to create a secure system.