I suppose it's difficult to account for the inconsistency of something able to perform up to standard (and fast!) at one time, but then lose the plot in subtle or not-so-subtle ways the next.
We're wired to see and treat this machine as a human and therefore are tempted to trust it as if it were a human who demonstrated proficiency. Then we're surprised when the machine fails to behave like one.
I have to say, I'm still flabbergasted by the willingness to check out completely and not even keep on top of, and a mental model of, what gets produced. But the mind is easily tempted into laziness, I presume, especially when the fun part of thinking gets outsourced, and only the less fun work of checking is left. At least that's what makes the difference for me between coding and reviewing. One is considerably more interesting than the other, much less similar than they should be, given that they both should require gaining a similar understanding of the code.