Loki is a similar deal. The time stone was taken from 2012 so when Loki teleports with the space stone it is in an alternate timeline. I've read somewhere that his show is going to take place in this alternate timeline but that might be unsubstantiated rumor for all I know. As for Steve returning the stones and staying with Peggy in the past, well I have issues with that. The movie only says that removing stones is what causes timeline splits but it stays silent on if any other actions would cause a split. For example, if after going to the past one of the Avengers killed someone, someone important to the timeline. That surely would cause events to unfold differently wouldn't it? So how big of a change needs to occur for a split to happen? Does Steve going back to Peggy, even if he keeps a low profile the rest of his life cause a split? Does someone's mere presence displace some air molecules creating a Butterfly Effect that results in some severe change in weather patterns? Since the movie doesn't give answers, we have to fill them in ourselves. I say that any change no matter how minor causes a split. So taking the avengers taking the stones from a timeline, Steve returning the stones, Steve staying with Peggy in the past, Hawkeye's test jump in the middle of the movie, all those cause splits. You posted a graphic a while ago that nicely summarizes the convoluted timeline nonsense. I'm pretty interested by WandaVision. I saw a poster that makes it look like some unsettling 1950s Stepford Wives inspired type of deal. I got no idea how that is going to work as Vision is dead and neither Vision nor Wanda were alive in the 50s even in any split timelines. It would have to be something completely different like an alternate universe unlike anything we saw in Endgame.