People generally neglect the fact that humans can perform amazing calculations nearly instantaneously. Take for example catching a thrown baseball - you brain can very quickly calculate where you need to put your glove to catch the ball, including variations caused by wind, ball rotation, variations in terrain, etc.
Creating an AI that could properly take in all the inputs necessary to calculate the flight path of the ball is pretty difficult - add in the calculations required to move a human body and attached glove to the appropriate place at the appropriate time across variable terrain.......
Humans (hell even dogs in this example) are more impressive than you might think.