Back in the day, the root server for Celestial's virtual communications was placed here, and so, with continuous updates and expansions, 'Zhuanxu' gradually became the true core of this myriad of worlds.
Nowadays, various companies, big and small, set up offices on 'Zhuanxu'. Rather than a city, it's more like a gigantic, ever-evolving intelligent hub, a host database platform.
With the energy provided by the Dyson Sphere, companies can station their hosts here, and flexibly replace central server components, updating the hardware as the QVN continuously evolves and iterates.
The tourism Super Dream of 'Zhuanxu' has long been a free film on the deep web. After all, being purely a Dyson Sphere, regular carbon-based life forms cannot survive here. There's no special spot for tourism in such a precious space; it's just a massive circuit board.
