With the declining moral fabric of the Prehistoric World, the ethos has increasingly worsened, far from the simplicity of bygone years. The root cause of this can be traced back to the failure of the Great Divine Transcendents in setting a good example.
When the masters themselves no longer cultivated diligently, preoccupied with scheming against others daily, their disciples naturally emulated them. Abandoning earnest cultivation, they engaged in plots and intrigues, and over time, the ethos naturally deteriorated.
All of this was known to Honjan Daizu, but what could he do as a being who had merged with the Tao, effectively retired? What use was there in knowing?
Now that the Saints governed Heaven and Earth, for an old retiree like him to step forward and wag his finger would not only be an affront to the Saints' dignity but also an annoyance.