What's the point with that quite lackluster story in Endwalker?

[Sicno]

They came to a point where they said "this is perfection" and then stopped changing, growing, or maturing. They stagnated. I don't think the message in EW is so much "perfect is bad" as much as "you should never stop trying to do better".

The implication that "perfect is bad" is hard to shake off when they show different societies which reached different states of "fulfillment", "enlightenment", "perfection", "immortality", etc. and they all "reached" a catastrophic end (in some cases by nothing more than the power of the writer's pen imo and not a natural progression of events). Not a single one managed to keep living their lives. How can you shake off the implication that reaching such a state is indeed a bad thing with such representation?

But to be completely honest all those societies feel very manufactured for the sole purpose of being lectured by our cast of protagonists from a position as imperfect beings. It doesn't even matter if their speech made any sense or not. The point is "these imperfect beigns are lecturing far more perfect or powerful beings, validating Venat's decision to make the world as imperfect as possible". I'll agree that the true message isn't "perfect is bad" but as others have said earlier in the thread it's "not being on the protagonists side is bad".