Insofar as the nature of most human lives, you could say people aren't that complex and live the vast majority of their time by routine. On the other hand, the routine nature of most of human existence is irrelevant to the instances when people flex their free will, which are myriad, unpredictable, and astounding.

What are the predilections that led Newton to ponder gravity after an apple fell on his head? Compared to those forces, a goal programmed into an AI is as complex as an amoeba.