Human intelligence is powerful because we take some amazing shortcuts saving us a massive amount of time and energy allowing us to do what no other creature can.

Human intelligence is also powerful because when the assumptions we put into those shortcuts are incorrect things go terrifically wrong.

indeed, but i would say that is a property of all intelligence in a finite world. Even if you have the most brilliant computer, because we live in a finite world, it would also develop the need to take shortcuts to move forward.