There are cases where having a human in the loop is appropriate, particularly manufacturing. A human, thanks to a combination of slowness and observation skill,

There are cases where having a human in the loop is appropriate, particularly manufacturing. A human, thanks to a combination of slowness and observation skill, will pick up on a fault after the first error while a machine, thanks to a combination of speed and lack of observation skill, will produce fault after fault until things come to a crashing halt or someone notices before that happens. This $440m example shows that a human should be thrown into the mix. Let the human/machine strengths cancel out each other's weaknesses.