Okay, so! Forgive me for being a silly grognard and beating a dead horse here, but despite this forum now being flooded Venat takes, I feel like I want to get something technical about the narrative off my chest.
So, in Elpis, we travel to the past and tell Venat, in broad strokes, what happens to the Ancient world and everything she does up until the present day. Then, after we go back to the present, she ends up following the scenario we gave her to the letter, creating a closed time loop. After this, three explicit suggestions are given for her motivations in performing the Sundering over the course of the rest of the expansion.
1. She felt that humanity at the time was unable to cope with suffering and loss, and this was going to lead to Ancient culture down a path of immorality and self-destructive behavior which had to be stopped. (The story is not specific about whether this was just preventing the sacrifices, or whether it was about something more fundamental like leading their civilization down the path of the Ra-la and other dead civilizations; regardless, that isn't important for this post.) This is suggested in the monologue she gives at the end of Elpis.
2. From a purely pragmatic perspective, she realized that humanity would only be able to defeat Meteion and prevent the Final Days if they were better at controlling Dynamis. This is suggested in her death scene.
3. She wanted to close rather than branch the timeline, giving you a chance to save your future specifically, which required her to not deviate from the story you told her. This is suggested tangentially in the death scene and again in the final Emet Scene in Ultima Thule.
Now, 1 and 2 are already a little contradictory - if it was always a necessity to Sunder the Ancients no matter what to save the world, why bother trying to convince them to change their ways? Why lecture them in the way she did? - but if we interpret the plot point symbolically as a lack of control over Dynamis just being a literalized representation of the Ancient's emotional immaturity, we can sort of overlook it.
The real thing I'm still hung up on is the contradiction between 1+2 and 3.
There are two ways you can interpret the "Venat creates a closed time loop" plot point. The first is that she did it incidentally (what she thought was wise at any given time merely happened to line up with the story you'd told her, until she eventually just decided to go with it) and the second is that she did it intentionally (from the beginning, she gave up her own agency and just carried out the script you gave her, with the intention of ultimately saving your world).
Right?
(continued in first post.)