Demi-humans were born with robust bodies and did not need to go through Purification. Their meridians were unimpeded and simple, so they could directly draw in starlight and convert it into true essence. However, it was precisely for this reason that a flaw appeared: demi-humans simply could not use many of the powerful cultivation techniques developed by humans. Even if an occasional genius would appear and use a similar method to the one that Chen Changsheng taught to Luoluo, it could only be considered an imitation. When cultivating to the highest level, they would encounter many challenges.
The meridians of humans were as complex as the sea of stars. True essence flowing amongst them could imitate the heavens and earth, could display countless masterly techniques. However, the constitution of humans was much weaker, requiring long periods of time drawing in starlight for Purification, and when breaking through, it was easy for them to die.