Yeah, it's a pretty confusing thing to think about, because in Doctor Strange I remember him regenerating an apple without messing with the spacetime around it, but then I also remember Thanos resurrecting Vision, which makes me think if he did the same process that Thanos did with Vision and resurrect Stark, the snap of the fingers would likely be undone and Thanos and his entire army would return. So it's a very complicated thing to analyze.
