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

[Jagick]

If she tells them all that she knows about the Final Days and works with the Ancients to successfully avert the looming tragedy a time paradox is created. The Warrior of Light would have never existed. No one would have ever travelled back in time to inform her of the calamity that is yet to unfold. Venat will not have been able to avert the Final Days because she doesn't know anything about them. And we are at the place where the Ancients never survived through the Final Days and everyone either died out or sacrificed themselves to Zodiark because Venat didn't set the world asunder because she held to no hope for a brighter future since no Warrior of Light came from the future to her time to inform her of what lies ahead.

Venat having to stay silent and let the calamity unfold was the least illogical way of preventing or handling the Time Paradox created by our Time travel.

This sort of thing in general is why time travel is bad writing and very difficult to pull off. Personally, I didn't like in Attack on Titan, and I didn't like it here. A character in the present goes into the past to engineer the situation that happens in the present that can't even exist without them existing in the future to return to the past from their present to resolve their future. I don't even know what I just said because it makes no sense. Time travel will never not be a paradox and cause you to write yourself into a corner.

The bottom line is that we never should have time traveled or had memory wipes in Endwalker to begin with.