He really doesn't. Its very easy to infer from dialogue the key points of what happened.To add to this, my brother said he doesn't have much interest in ever watching Doctor Strange: Multiverse of Madness even though he loves Doctor Strange. Why? Because he knows that to really understand it as much as he can, he'll need to at least watch WandaVision as well, and in his words "I shouldn't need to do homework to watch a movie."