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

[Cassar]

I like to pretend Venat actually forgot too, but because of how she is she still turned into Hydaelyn and then remembered us and that Meteion is still alive*. That way it gives more of a feeling that some things are written in stone and meant to happen, rather than happening because we intervened.

*could also explain why Hydaelyn 'chose' to shatter Zodiark, rather than destroying him, cuz she knew he's ironically what kept Meteion from coming back.

Elidibus did say "Yet even should you manage to interact with others, you will be unable to effect meaningful change."
Meaning he hard confirms that whatever we do in Elpis has no severe implications in the course of history, so we didn't really "intervene", we were just present as the events unfolded.