As I've mentioned before, the main problem with Endwalker and, indeed ones that a lot of media fall into both Eastern and Western, is falling into "Humanity Worship", whereby humans (or whatever creatures are similar enough to them) are presented as being way more special than any other creatures, with the preservation or cultivation of humanity being a worthy end in and of itself.

In short, "humans" and all of our characteristics, both "positive" and "negative" are all good, necessary or justified.

Endwalker's plot doesn't work unless you inherently believe that. The Ancients are supposed to be "scary" because they lack arbitrary traits that make us humans in real life (oh no, they're immortal, have no scarcity whatsoever, and have virtually no internal conflicts whatsoever...how horrible!). This, in turn, makes you have to explain why things that are objectively terrible things (such as suffering and death) are actually totally good and things that would be objectively good (like, y'know, literal PERFECTION) are actually really, really bad and you should never want it ever because it's actually completely worse.