Your example wasn't a good example. For starters, it's literally a binary decision to make (yes/no: is this jstx1 trying to unlock the phone?).

Most of the tough, interesting, challenging problems in this world don't boil down to binary decisions.

Second, facial recognition doesn't depend (inherently) on artificial intelligence. It's not a great example. It's not a truly interesting, tough problem. It's not in the realm of fuzzy logic, concurrency, periodic or aperiodic behavior, or nonlinear relationships.

Could a Neural Net do it faster? Yeah, sure, maybe. But so what? You have a quicker algorithm, a faster heuristic.