WestView Theory #1: Wanda Created WestView as an Alternate Reality
The popular theory is that Wanda created the sitcom-reality she's living in as an escape from her real-life – the one where she's lost her lover and last hope for happiness. The premise of the show supports this theory because it gives Wanda the picture-perfect ending she wanted — a new life with Vision in an idyllic town.
There are also plenty of moments in the first few episodes that give the theory merit, including Wanda's ability to "rewind" time when she desires. Everyone in the town keeps up the facade of happy-go-lucky neighbours around Wanda, as if they know their fates are in her hands and they must keep her happy, with Dottie Jones being the sole exception. During the near-fatal dinner with Mrs. and Mr. Hart, it's only after Wanda permits him that Vision moves to save the life of the choking Mr. Hart. Whenever someone or something occurs that upsets Wanda, like the mysterious beekeeper or Vision having moments of clarity, the events are reversed as if they never happened. And of course, there's the fact that Wanda was able to throw Geraldine out of WestView in the third episode.
All this would suggest that Wanda is the magic-user controlling what's going on behind the scenes of WestView. These are the moments where she seems the most aware that there's a world beyond WestView and her actions make it clear she prefers to stay in her sitcom reality. If that's true, it makes sense that she'll have to be pulled out of that reality eventually — which would be the perfect reason to bring in Benedict Cumberbatch's Dr. Strange and segue into Doctor Strange in the Multiverse of Madness.