Endwalker's message (spoilers!)

[Kaliesto]

Its a story as old as time, the yin cannot exist without the yang else one's personal growth is stagnant.

There is a little bit of Daoist beliefs in the game here and there (though I'm not 100% sure if the devs. were following that philosophy)

This game almost kind of mirrors Dragonball in a way, and Dragonball is known for mirroring alot of the story of Sun Wukong, and especially into Dragonball Super; there is a lot of Daoist beliefs in it in that anime too (pay attention the character Goku and what he does throughout the whole series, its not really random as one might think).