Our brains alone did not create our amazing global civilization. There is culture, physical advantages, and long development of collective knowledge. With the same brains, we used to make stone tools and sew animal skins, was about the best we could do.
A bear with an IQ of 100 could not do more than the current bear stuff. It could not build a cave, plant its berries, invent math, or anything. It has no opposable thumbs, can't handle a complex social system.
Name me one animal that could match our achievements with equal brains alone, and why.