You mean that 5300 is worse because people will pay less attention? Well, would it be better if it had a random chance of (artificially) needing human interven

You mean that 5300 is worse because people will pay less attention? Well, would it be better if it had a random chance of (artificially) needing human intervention, at on average every 785 miles? (Not exactly, because that would make it too easy to predict, and therefore might not make the person attentive when a real problem happens) That doesn't seem like it would be too hard to add, if it was better by keeping people on their toes. But, I doubt the problems get monotonically worse when the average distance between events increases? I would expect at some point, increasing distance doesn't significantly reduce attention , so the safety would increase a bit. Maybe not more than for some shorter distance, but I think for some slightly different distance.