I am a WandaVision fan. I'm not part of the absolutely wild Twitter / TikTok / Instagram fandom around the Scarlet Witch and Vision, but I do understand the appeal and I am happy that the fandom exists. With that said, both WandaVision and Doctor Strange in the Multiverse of Madness have more symmetry and things in common than most people realize I think, either by their own bias or for not paying enough attention.
WandaVision is about how you deal with grief. In a lot of ways, that's precisely what Multiverse of Madness is about as well, not just from Wanda's perspective, but Stephen's as well. Our Earth 616 Wanda is the Scarlet Witch, a nexus being, which means that in every other universe, Wanda isn't the Scarlet Witch. Like her, same goes to America Chavez, with one caveat: there isn't another America Chavez, unlike there are other Wandas and Stephens. She is a pure nexus being, hence why both her and our Scarlet Witch are so powerful.
It's interesting how in Multiverse of Madness, we are constantly being reminded by the consequences of the main characters actions, and not just that, how much their actions ended up having consequences into each of them. For example, when Dr. Nicodemus West approaches Strange at Christine's wedding, he asks Strange if that was truly the only way. It's clear now that in fact no, it was not. It was the only way in which Stephen survived, yes, but that had major consequences to Stark, the world and well, Wanda and Vision as well. In this film, Wanda isn't seen as a threat, but in fact Strange is. He is the one that in all the universes we've seen other than Earth 616 that his actions lead to the end of the world.
And that happens because very much like Strange, Wanda is also a person that wants to control. Earth 616 Wanda is a nexus being because she is the only one that became the Scarlet Witch, and in all the other universes according with this film, Strange is the one that always evolves to become an actual threat. In fact, it's likely that our Wanda wouldn't become the Scarlet Witch if things had gone differently during the Infinity Saga, which was very much Strange's plan at play.
The difference is that our Earth 616 Strange didn't became a monster for losing Christine (like What If… Strange), or didn't try to take away America Chavez power like ponytail Spanish talking Strange in the beginning of film, or to defeat Thanos like 838 Strange or the one at the end of the film consumed by the Darkhold. Wanda was so adamant of bringing his lover back to life that she controlled a whole town and even after being warned by Agatha that becoming the Scarlet Witch would doom her, she chose to try to not control just one town, but the whole multiverse in order to bring her children back. Wanda only learned to let go after facing her children variants seeing what she became, while Strange after finally professing his love for Christine and saying that he loves her in every universe, gets the lesson that sets him apart of his other variants and Wanda herself up at the point: he learns to let go and face his own fears. Wong says that the only way to stop Wanda is to take away America's powers, essentially killing her. Strange learned to let go not just of what he thinks it's her love for Christine, but his necessity for control, he chose to trust America instead.
Our Strange, just like Wanda, was just one decision away of becoming the multiverse's biggest threat, and I feel like both WandaVision and Multiverse of Madness elevate and speak to each other more than we are realizing so far.