Originally Posted by
gurkle
They left it ambiguous because it wasn't the point -- they didn't want Wanda to be fighting the villain's plan to take over the world or whatever, because they didn't want there to be a true "Big Bad."
The fight with Agatha was only about who would get to keep the powers of the Scarlet Witch, just like the fight with the two Visions was just about who was the real Vision.