Script Space contained a diverse array of scripts, since the players hailed from different worlds; their existence was also the source for the plethora of scripts with varying world backgrounds.
In Xu Shuo's current world, there was already a "Director", and perhaps there was more than one Director worldwide.
The reason he had no ambition to become a Director was simply because the job was too time-consuming!
It was evident from Luo Kai's constant running around and his reluctance to give up on a script when confronted with a new type of Mutant Script he wasn't familiar with that extracting approved scripts from the system was somewhat challenging.
If he were to change careers to this profession, he'd probably have to, like Luo Kai, pack up and travel the world, which also meant giving up the studio he had just started.
More importantly, Script Space did not allow for the exchange of real-world currency, so Xu Shuo couldn't earn money from it.