There is so much more to it than “brainpower” or “computational ability”. For example. if you put AI knowledge in a computer running a robot. How will it know one of its own screws is coming loose? How will it tighten it? What if the screw is stripped? The point is AI can do wonders as a computational marvel. It cant do anything with that without humans facilitating it to do more and we can always disable it. Just like we can’t win a fight with a tiger, but we can cage it and we can shoot it.