Structure influences functionality. This is the case in both engineering and biology. For example, dolphins have tails and flippers while I have arms and legs.

Structure influences functionality. This is the case in both engineering and biology. For example, dolphins have tails and flippers while I have arms and legs. No one disputes the dolphin is a better swimmer and I am the superior runner. Why should this be any different with brains? Brains with different structure are suited to different things.