Actually... Kaguya admired Fu Hua a little, especially her Tai Xu Sword Qi.
After all, she had already taken the Hourai Elixir, transforming from an ageless, immortal Moon Person into an ageless, undying Penglai person. Though she had gained the power of agelessness and immortality, it had also become difficult for her strength to improve. Yet... the Tai Xu Sword Qi was completely unaffected and could be cultivated normally!
The Hourai Elixir was equivalent to fixing a person's soul in place. Even if their entire body turned to ash, they could quickly recover to the state they had been in when they first took the medicine. In essence, it was similar to Princess Kaguya's ability. Furthermore, while Penglai people were ageless and undying, they would still feel hungry if they did not eat, and they could still feel pain when injured.
When there was nothing to eat, they could even kill themselves, then eat their own corpse after reviving... probably.
Although they were said to be "ageless and undying," strictly speaking, it should have been "able to revive immediately even after death." And because their true body was the soul itself, they could move in soul form and revive wherever they liked.
After taking the Hourai Elixir, it was difficult for one's strength to progress, yet the Tai Xu Sword Qi ignored that limitation. That was incredibly impressive! It was practically like that exceptional Eirin and Meiling.
The Hourai Elixir could only affect the living, and after taking it, the person's strength would become difficult to improve. The elixir also seemed to be stored in the living liver. Even if they turned to ash, they would revive, and they would still retain physiological reactions. Mei Hong, however, was an exception... After taking the Hourai Elixir, she could still continuously grow