system
Given the following post, respond as if you're commenting on Reddit:
human
[Endgame Spoilers] How do we know that the main timeline...

was NOT visited by some future timelines avengers to get the stones? Multiple times? 


So by natural progression of time, the Snap is inevitable. Which means that if every timeline ran the exact same away, the events of IW and EG would happen in all timelines across  the multiverse.

So if the snap and the end of Thanos are both inevitable,  does it mean that in the main timeline, in 2012 when the avengers were in New York, a group of future avengers showed up?

Does it mean that the Ancient one knew that it would happen? Or is it something beyond the capability of the time stone? Because if this is inevitable, how would the ancient one not know from her view to the future? 

And if she didn't see it, does that mean the main timeline is the only one where things get fixed? If so, why wouldn't other timelines Dr Strange see the 1 in 14m605?
gpt
I think we know the main/first(I'll be calling it the first timeline because it's easier to reference and think of, as these timelines (I believe) are more sequential, than constant.) timeline  wasn't visited by future avengers because none of them remember the events happening, like tony having a heart attack, the cap 1v1, and loki getting away. Now maybe in another timeline they did it smoother, but more likely worse seeing as though the first is the 1 where they get it right.