Good point, though they’re not really simulations per se. They legit happened in the story, and the branching timelines happened because of the high density of Aurora, afaik. It was the biggest explanation for the Kotarou on the Moon being the convergence of all the Kotarou in the timeline. Plus the bonds that he created in the branching routes were exactly the ones he needed to bring his Okaken friends to the Moon.
I’ll be glad to welcome the changes in the storyline, but if that means throwing away the stories in the VN that made Rewrite Rewrite, then that would be a waste.
Though I’m slightly nervous on how they’re going to pull this change off, it seems like they’re thinking these through very well, which should be a good thing.