I think part of the point of the article is that it also makes edge-cases more dangerous and catastrophic than if there was no autopilot at all. From the article:

>The argument for automation is that it frees up cognitive bandwidth. Fewer routine decisions means more headroom to think carefully about the ones that matter.

So if the expectation is that the human pilot is expected to pay attention to mitigate the dangerous edge cases "that matter", there is a contradiction: the tool that promises to free up the bandwidth for that attention creates a complacency that prevents that attention from being applied.

In other words, it makes the normal situations safer but the abnormal situations more dangerous.