After Bu Jing fell asleep, Jiang Li and the group discussed the future of Ring Universe. They unanimously decided not to introduce the cultivation system, and it would be sufficient to get people back on track.
Wuguo is a combination of martial arts and cultivation. It's not pure martial arts, their cultivation cannot be separated from spiritual energy.
The martial arts of the Ring Universe are pure martial arts; they do not require spiritual energy. Although this is mainly due to the scarcity of spiritual energy, this in and of itself is not necessarily a bad thing. It has shown them that people can still reach high cultivation levels without spiritual energy.
They wanted to see if, given enough time, the Ring Universe could produce those who could reach the Transcendance Tribulation Stage, or true Martial Immortals through martial arts alone!
However, the prerequisite for this is that the martial arts scripture of the Ring Universe has not been lost.