What void? Transhumanism is improving your life with tools (Ais).

What void are you filling when you use a power drill to make holes in a wall instead of say using a sharp stick to do it? What void are you filling when you drive a car instead of walking? What void do you fill when you draw with a pencil instead of your fingers?

This question implies an assumption that there's some sort of void whereas in reality people just want to have nicer, easier lives with less: misery, suffering, pain and death.

Your other point is just as vapid of reason and rationality.

Even if my IQ was 10k I would still like the same things - creating worlds. I would just create more complex worlds if I had more IQ.

Problem solving might have a hard limit, building and enjoying virtual and physical worlds does not.