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

[Lauront]

See I think we’re actually fairly close to an understanding. I just think the criterion you laid out makes the third sacrifice an abhorrent act of selfishness born out of an attempt to hide from pain, a sign both of the Ancients inability to see life beyond their own as being deserving of true moral consideration and of their refusal to accept the inevitable of suffering in the world. The former is a moral failing, the second would lead to extinction.

This is a species here that faced near total devastation of their planet and their own people. If we're talking about the exchange of souls that went into some entities born of their creation magicks, it is plainly obvious to me why they'd consider the option and exercise a preference for their own people and perform an exchange of the souls held in limbo in Zodiark, particularly since these familiars were rather more childlike entities compared to them and in need of a lot of handholding if they were to inherit the star. The sundered would kill for far less, after all; my own character, if a reaper, powers up their voidsent battery by letting it devour the souls of those who get in their way. As a SMN? I routinely have my egi (arcane construct) get in the way of harm. Nevermind things like how some relics are formed, what goes on in fates etc. So these delicate sensibilities when it comes to the ancients doing it baffle me a bit. If it's ancients for ancients? Then I'd agree that such a course would be contentious but unless and until the devs take the time to clarify it, I maintain it is shrouded in ambiguity.

In any case, had a certain someone explained the practical concerns she had, then it all could've been avoided. Even were I to consider it to be a morally flawed path they were going down, I'd still not consider it adequate to excuse the sundering. For that, we have contrived time travel mechanics to take the brunt of any criticism, of course... all in all a very unsatisfactory mechanism to me that left many of these issues unanswered, obscured (as can be seen from this very thread and the confusion of some people on the topic of the stylised scene vs the more detailed elaborations from SHB materials) and also left me with a very dim view of Venat.