However, conspiring with outsiders to plot against the Qingling Primordial Lord is treacherous, colluding with outsiders, betraying the Taoist School, which is a grave crime.
Of course, such issues can be significant or trivial; if one has backing, it's simply dismissed and no one will investigate deeply. But if there is no protection, once exposed, it will attract attacks from all sides, and no one will intervene.
In the end, it's because he is an Independent Practitioner, having no foundation within the Taoist School, at least lacking the reliance of a Taoist Monarch relative to his position.
Even though he is now negotiating to obtain a Divine Position in the Nether Yin Department, planning to become one of the Ten Halls of Yama, the Wood Virtue Star Lord still isn't willing to abandon his identity in the Taoist School, nor does he want to join the Witch Deity Teaching, even if he is just an Independent Practitioner within the Taoist School.