The yin attribute power within it was beneficial to ordinary cultivators and was compatible with the foundation of the Acquired Divine Race. They even considered destroying the Netherworld, which would also deprive the Acquired Divine Race of a foundation for cultivating ordinary cultivators.
However, the existence of the Netherworld was very special, and they couldn't even locate its external form. Moreover, after some thought, they realized that the Acquired Divine Race wouldn't lack for such a foundation, so they gave up on the idea.
Because of this, the Blue Lotus God Monarch had some understanding of the Netherworld.
The Divine Realm of the Spirit World couldn't enter the Netherworld, and this was the same for the Innate Divine Race as well.