Endwalker's story had me, but lost me. Ethical issues especially (spoilers)

[Veloran]

Now, this is utter bollocks. But every single thing about time travel is utter bollocks. If you're willing to suspend your disbelief to accept everything up to that point, what makes that last bit unacceptable? It's built entirely on things the writers have already established, and in no way contradicts them.

That was quite a long post just to conclude with "it's dumb anyway, just accept it." But no, I won't, because the story never bothers to establish any internal logic suggesting a single derivatively-branching connected timeline, nor that the two are connected on the same branch, rather than, say, the concept of wholly parallel worlds. Your explanation is primarily your own headcanon and personal interpretation of how it works, for which I see limited - If any - evidence for within the narrative itself.

It's easy to say "time travel is bollocks", but the issue isn't with the time travel at all, it's with the writers not taking care to develop how these concepts function within the world.