*causal (as in one thing causing another to happen), not casual. But anyway.
My long-running theory on this is that there is no contradiction between how time travel works in Shadowbringers versus Endwalker -- or rather, at the time I developed it, Shadowbringers versus Alexander, and then Endwalker seemed to follow the same rules I had figured for the earlier stories.
In short, as I figure it, time "prefers" to keep to a single timeline and will naturally incorporate any actions from a time traveller into the one and only version of events at the place-and-time they have journeyed to, so much as that is possible.
The only way to potentially overcome this is (1) for the time traveller to have come from the future with detailed knowledge of events at their destination, and (2) then cause changes which make the world incompatible with the future that they came from, at which point the timeline splits in two to prevent a "grandfather paradox" situation. The original timeline continues to exist because the time traveller's existence relies on it, while the second timeline carries the changed version of events.
G'raha's preventing of the Flood of Light is the only example we have which meets both of those criteria. He came prepared with very specific knowledge of what would happen -- "the Flood of Light will be triggered by the Garleans using Black Rose at the battle of Ghimlyt Dark, which causes the Light-soaked First to rejoin", probably with an exact date attached -- and he took actions that defused the situation in the First so that exact scenario could not happen.
All the time travel instances which resulted in stable time loops do not fill those two requirements:
- When we travelled to "three years ago" in Alexander, we had no opportunity to act and change things, or else our actions inadvertently made things happen as they always had; additionally, we were reliant on Mide's incomplete understanding of the situation. That doesn't rule out the possibility that we could have changed things if we took different actions.
- During the same incident, the Illuminati have the detailed knowledge they could hypothetically use to thwart the chain of events, but they are acting on the belief that they need to fulfil the events described by the book.
- When Alexander sends us back to "save ourselves" from its earlier attack, we of course succeed in doing so and thus help to create the same event we previously experienced.
- And finally, in Elpis, we have no knowledge at all about what happened to cause the Final Days, so there is nothing we can act on to prevent it. We know "something" happened, but you can't prevent "something"; if you try to prevent one something then it will just turn out that a different something was the actual cause.
On the contrary, given that our purpose was to observe the situation as it was, and gain an understanding of what happened in the past, it should have been really important to observe things and not give the people of the past any future knowledge at all.
I take it as a necessity that we needed to be able to interact with people and the world for that part of the story, because delivering that much exposition through only observations would be difficult.
So, our choices are to tell everything and risk them altering their course because of that future knowledge, or to keep silent on the subject and observe until we see the unknown and undefined clue we are looking for that tells us why the Final Days happened.
It could have been handled tactfully, once Venat deduced we were from the future, by explaining to them that "I've come from a point in the future where we are facing a grave threat to the star, and we understand that at this point in the past you faced a similar threat and somehow overcame it, so I want to observe things here and see how it begins."
If it was handled like this, I could see the ancients being of the opinion that it seems fair to not risk altering events and causing a paradox, and so they will not ask you for information about what happens in their future. They could even proceed on the logic that it's fine for you to hang around and interact with people while you're here because your presence will just be part of the timeline as it always was.



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