If one was born early enough, lived long enough, and one's forbidden memories weren't
erased by more transcendent beings, they would surely remember (and
such beings do exist in
Teyvat) that before the
war of funerary flame, the
Three Moon Goddesses, who served
Nibelung, once coexisted harmoniously with the principles of
Celestia for a time.
Of course, if one were to inquire about this matter with Celestia, the high heavens might respond with ambiguity. The Three Moons were once satellites that guarded Teyvat, and the Moon Sisters were executors of the planet's will. Celestia's principles were once quite "tolerant," not necessarily requiring the exclusion of those divergent from itself.
For the Three Moon Goddesses, their sole duty was to maintain the planet's existence and operation. And so the moonlight continued to illuminate the lands of Teyvat. Alas, even they, who kept to themselves, could not remain uninvolved. Inevitably, conflicts between those in power would affect some of those who were subordinate to them.