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

[Kyohei]

I feel like this is the case with almost all of the writing in EW, it presents conclusions while providing little evidence the one they arrived at was likely.

Mmh, no I think it's the other way around.
It presents evidences but reaches conclusions ignoring them. For example this infamous scene at the end of Elpis segment. We see through Argos that the ancients in front of Ktisis are witnesses aware of the existence of "azem's familiar", we see Emet-Selch annoyed that his memory got played. But we reach the conclusion that it's better to not try to explain what happened, ignoring that there are elements presented just before that could have weighted in favour of the re-explanation.