None of this is surprising given the practicalities of game design. Also, AI infrastructure and real-time game infrastructure don't mix very well. Modeling human limitations Both humans and, to varying degrees, other animals, have sophisticated cognitive abilities. However, those abilities are severely limited both in speed and attention. While people are very good at planning long-range strategies, they can't do it while simultaneously fighting off a horde of angry monsters.
Human perception is very limited.
We can't see behind ourselves. We can't see around corners. We're much better at detecting moving objects than static objects. Perceptual attention is also severely limited. When fighting one enemy, we are much less likely to even be aware of another enemy approaching.