Endwalker Story sucked and it's time to admit it

[Iscah]

Regardless of where it branches off, in Graha's original timeline, before he jumped ship and changed his own future, there was a past that happened. This is what a timeline is. Point A to Point B to Point C etc. He diverged his timeline after Stormblood, which enabled the WoL to be able to go back in time. In this new timeline, which is seperate from the original because we now exist in it again [...]

Diverged the timeline, yes. That means to separate into two streams at that point while remaining a single stream up to that point.

But to say we "exist in it again" is misleading. He went back in time to a point before we died and created a path where we never ceased to exist in the first place. There is no gap.

And you're still not giving any reason why changing events from Stormblood onwards should mean that the timeline separates into two completely separate timelines with different pasts all the way back to Elpis, even though G'raha started in the same timeline as us with the same past as us.