A person can usually focus on only one task at a time, but John Han can focus on thousands, even millions!
This is because John has a CPU in his brain that can be upgraded. The more advanced the CPU, the greater his computational power, and the stronger his abilities become.
He alone can control billions of robots to develop a planet, build an extensive industrial system single-handedly, and produce ten thousand interstellar warships to wage vast cosmic wars.
John Han, by himself, is an entire civilization.