This is side question, but when Captain America returned the Infinity Stones to the past, they weren't in the same "form" as in they left their pasts. The Mind Stone was in the scepter/spear form in the past, but he only returned the stone sans scepter. Same with the Space Stone; it was sans Tesseract. Same with the Reality Stone; it was not in Aether form. Same with the Time Stone; it was sans Eye of Agomoto. Didn't the other verses get "divergent" due to these changes? Maybe The Ancient One was the first stop, and she used the Time Stone to "repair" the missing pieces.![]()
I think the Ancient One's objection wasn't so much about changing history, but that the physical absence of the Infinity Stones (or their constituent atoms) would destabilize reality on a fundamental level. It doesn't matter if the stones go back as a solid rather than a liquid, or floating freely instead of encased in some sort of tool. History will still proceed in some different way (especially for the reality where Thanos and his army went through a time portal, never to return), but the universes won't implode because of the absence of the stones.
David cgc is correct. The stones didn't have to go back to the exact same place and serve the exact same purpose as they did in the original timeline, they just had to go back to the exact time in which they were taken from to ensure the continuity of the new timeline.