questions doctor strange multiverse of madness

First of all I loved the movie, but I have some doubts about it and I think it's a great way to start

1) Why do they change shape every time the universe changes? Shouldn't they keep their shape?

2) Why are they called illuminati? I know it's a reference to the comics...but in the movie, what's the point?

3) Why doesn't the superhero vision appear?

4) Isn't that house the same as the one in the Wandavision series? Are you telling me that in that universe she still has Westview down?

5) robots are sentinels? ultrons? What are they exactly?

6) Is Wanda still alive? I think so and you?