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

[Brinne]

I think in my general view, the Ascians and Hydaelyn are roughly morally equivalent, YMMV with closer nuances between them. The Ancients pre-Final Days and pre-Sundering, though? Nah. The Ancients were victims, and Venat (with Hermes) was their killer. I don't really accept a "no clear right or wrong" in that context, at least as far as my own values go, especially with Endwalker's clarification that Venat's concern about the sacrifice plan was not on behalf of the actual sacrifices which, again, she was also perfectly willing to kill so long as she could also kill every Ancient besides the three she needed.