Marvel Studios producer Richie Palmer addressed the chatter surrounding Magneto's reportedly scrapped role in Doctor Strange in the Multiverse of Madness.
When asked if Magneto was ever on the board for inclusion, Palmer indicated that a Magneto appearance was briefly discussed between himself and writer Michael Waldron, stating in a double-negative that he's "not going to say those things (about Magneto) never came up in conversation." However, the producer also admitted that Magneto was "[not] seriously talked about" as it may have been too much to explain in the film and it might have "detracted from the experience." Palmer also teased the idea of introducing another version of Wanda Maximoff who might actually be Magneto's daughter:
Chris Hewitt: "You're dealing with different realities here. Wanda, in the comic books, as you know, is a Mutant. Her father is Magneto. Was that something that you toyed with at any point, to introduce us to Wanda who was a Mutant, who had a dad who was Magneto, or was that just too much heavy lifting to do?"
Richie Palmer: "I don't know if that was ever seriously talked about, again, that [Michael] Waldron's got a head full of crazy ideas, so, I'm not going to say those things never came up in conversation, but I think once you start getting into Magneto and explaining Mutants, you know, I think that the Illuminati appearances in this movie are pretty self-explanatory. I think you get them and you know... I think it's all right there for you. To go any further with it, and to try to explain that stuff, might've detracted from the experience. However, who's to say in this universe, that's a different Wanda than our Wanda with a different backstory, there is a Professor Xavier there, there are Mutants, there are Inhumans. So, you got to believe she definitely has her own version of that story going on."
https://thedirect.com/article/doctor...2-magneto-show