Brandsdale
Big Yella
I get that majority of this stuff was explained in most movies but we only know that Agatha can ssteal magic. Her drawing from a dimension was never even mentioned she only shows her stealing the witches powers in the flashback and in the last episode in her fight against WandaBoth Agatha and The Ancient One (as well as Dr Strange and Wanda) draw their powers from other dimensions. Even the concept of hell in the MCU is a dimension.
Dimensions = multiverse.
But you're trying to get an explaining on the multiverse in a cinematic universe where space ships have the ability to jump to other galaxies in the time in takes to microwave popcorn
And Wanda being good or bad is subjective. Technically she was an avenger up until Civil War, then she was in limbo.
The movies have easter eggs to set up other shyt. When Wanda and Pietro were introduced everyone knew they were mutants, but because Fox owned the rights, they couldn't call them that. It was assumed they got their powers from the infinity stone but it was NEVER fully explained, leaving the door cracked to allow future explanation and expansion. Now we know They already had powers. The infinity stone merely unlocked and enhanced them.
And I got a feeling, the 3 infinity stone snaps that took place on earth by Thanos, Banner and Stark, will unlock mutant powers.
We also know from watching wandavision, that the infinity stones elements are comprised of CBMR (cosmic background microwave radiation) which it probably what triggers the unlocking of said powers.
So you see, there is a lot that has already been explained, if you look at all of the movies and put them together.
Things like that are is where if you leave too many plot holes missing, you most likely gotta account for it in a movie that would need to be longer to fully tell the story. All im saying is if there is this much left on the table and making a film thats 2 hours max just isnt enough time to cover enough easter eggs, especially if shows like Wandavision are currently only 1 season