Because people have different definition of what intelligence is. Recreating the human brain in a computer would definitely be neat and interesting but you don't need that nor AGI to be revolutionary.
LLMs, as perfect Chinese Rooms, lack a mind or human intelligence but demonstrate increasingly sophisticated behavior. If they can perform tasks better than humans, does their lack of "understanding" and "thinking" matter?
The goal is to create a different form of intelligence, superior in ways that benefit us. Planes (or rockets!) don't "fly" like birds do but for our human needs, they are effectively much better at flying that birds ever could be.
