Re: Unmasked
"Sufficient training data" is necessary (by definition), but not sufficient. Simply throwing more data at a model will often lead to over-fitting or other anomalies.
There's a vast and rapidly-growing amount of research on this problem area, and forum posts from non-practitioners will not capture it in any useful fashion.
Given unlimited resources - including time and expertise - it's possible to asymptotically approach perfect facial recognition. But resources are obviously not unlimited, and the practical limit on facial recognition for economically-viable use cases in the near future may remain mostly quite poor. Certainly in some problem domains, including the notorious job-applicant one, it appears to be little more than algorithmic dowsing.