I’ve obviously not played the game yet, so I’ll probably revise my thoughts about what all of this means once I have, but I feel like I want to get this written down before I forget.
In the past, I’ve thought about part two of this game, and how in it, every character has to come to terms with an aspect of their past. Barret faces what Dyne became after he ruined Corel. Red realises that his father died a hero. Cloud faces the fact that his memories aren’t genuine.
Regardless of what the ending really "means", the Whispers basically seem to show up in the story when things are about to diverge from the original plot - so with an element of “changing the timeline” introduced into the story; there is the opportunity to have all of those characters reflect on how this is how things were “meant to go” for them. They might want to change their past, but it would have serious repercussions on “the story” - and so, they accept, as they did in the OG, but with a mechanical representation of it. I don’t think it would be necessary, but it could be what they’re going for.
Either way, once you get to the point where Aerith dies, maybe the fact that it ISN’T reversed in any way; the fact that it happens regardless - maybe by that point, the characters recognise that this is the ONLY way this story could go and that bringing her back would be garbage.
It’d be wild if they went to such roundabout lengths to drive a point home that didn't need to be made. Even so, it could just be made by having it be a story that works on its own merits, without having to include fate LITERALLY in the story.
For the most part the game sounds phenomenal - the characters in particularly have better characterization than they've ever had. Which makes it so weird that which such a devotion to what makes the story WORK, that they choose to SO EXPLICITLY feature the idea of changing it. I worry this won't make any sense to the people who have been told this will be their chance to play an updated version of a classic game, if it barely makes sense to the people who've played the original over and over.