But none of them have reality warping powers and read the Darkhold...
And in the comics actually scarlet witch gave the darkhold to five avengers (including iron man and the wasp but that's all I remember) so they could help her stop some monsters from escaping Chthon's dimension, but they all turned dark even quicker than she had when she first read it.
It's just as Doctor Strange said. The darkhold corrupts everything and everyone it touches. Seriously, why would it show Wanda other Multiverse with her kids? And why wouldn't she (after a whole year of thinking things through) have come up with the solution of working with America Chavez to find a universe to get to her kids, instead of trying to kill America to do it? The reason is that the darkhold just wants you to be evil. It was written by a demon.
Dang I didn't expect to write this much