The more the brain is used the better it gets. I would look at this as a co-evolutionary trait. Hands help brain, brain helps hand. Without hands it would be ha

The more the brain is used the better it gets. I would look at this as a co-evolutionary trait. Hands help brain, brain helps hand. Without hands it would be hard for the brain to be useful. Maybe thats why octopuses are so smart, they can manipulate their environment.