I mean, the Echo literally lets you see the attacks of opponents before they happen. Also, every time you fail a duty, it is canonical that it was the Echo granting you a vision of what would happen if you attempted it at your current strength/mindset. The whole "empowered by the Echo" mechanic is described as you having learned from the vision and using that knowledge to defeat your opponent. So we already have some manner of precognition.
Back to the Future used a different set of Time Travel rules. There are many rules and paradoxes to time travel, but the one FFXIV uses in Endwalker is the Predestination Paradox, aka Causal Loop/Closed Time Loop. In layman's terms, it means this: The time traveller is in the past, which means they were in the past before. Therefore, their presence is vital to the future, and they do something that causes the future to occur in the same way that their knowledge of the future has already happened. Prior to going to the Unsundered World, us arriving in Elpis already happened, as stated by Elidibus. He had memories of seeing us in Elpis in the Unsundered World. This means that in our time, we had already been in Elpis all those years ago. Our presence in the past and our actions is what caused Meteion to become the Endsinger. If we didn't tell Venat and co. about the Final Days etc, then Emet-Selch wouldn't have pushed so hard to take Meteion into the Convocations custody and away from Hermes, and as such Hermes wouldn't have pushed back so hard. Hermes simply wanted to hear Meteion's report, but Emet-Selch was trying to prevent it. If Hermes had heard the full report, chances are he wouldn't have done the stuff he did out of desperation.
It's not a new future. The past occurred in our past. We have always went to Elpis to discover what was causing the Final Days. Our travel to the past is what inevitably causes the Final Days in the first place. Hence, closed loop. It's like learning that you were going to be hit by a car that day, so you stay at home, and then a car crashes into your house and hits you. If you weren't at home, you wouldn't have been hit by the car. It's simple causality; You were influenced by the knowledge that you were going to be hit by a car that day and as such stayed at home, which in turn contributes to the car hitting you; The cause is partly responsible for the effect, and the effect is partly dependent on the cause.



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