ShakyJake
<Donor>
That's not true. Frenzied Flame ending shows a significant post Elden Beast change.The only world-state change like that is the burning of the Erdtree, and then the fall of the capital when you kill Maliketh. No other world state changes from killing Elden Beast that I'm aware of.
It doesn't return you to an earlier point in time, that's the wrong way to think about it.