Because the mechanisms for encoding goals, planning, and updating on new information are completely different. They may malfuction in both cases, but you’ll be better off looking at how it’s supposed to work and how it fails than making a surface anaology with humans. Otherwise either you’ve just said “Both of these things break sometimes” or you’re going to run off and predict economic fluctuations by analogy to mood swings or something.
Because the mechanisms for encoding goals, planning, and updating on new information are completely different. They may malfuction in both cases, but you’ll be better off looking at how it’s supposed to work and how it fails than making a surface anaology with humans. Otherwise either you’ve just said “Both of these things break sometimes” or you’re going to run off and predict economic fluctuations by analogy to mood swings or something.