I honestly feel We Dodge a Much Worst Bullet with this reveal.
Yea it would have been more slowly, you could have had more understanding on why Wanda went Bad, while maybe being a better story. But I doubt it would have not had its story problems and plot holes we still be upset about so it would not have been more perfected of a story with this writing team.
Mostly however, it would have been FAR Worst for Wanda's Bad Arc, it would have lasted WAY Longer for sadly story wise understanding reasons, multiple movies and would have led to Wanda being a Bad-Girl for most of Phase 4-5 even, it would have been an era of Bad Wanda in which she could have done far worst things and hurt characters we honestly cared for, it would have hurt much more for far longer in ways that feel much worst.
As controversial as MoM is, the good things are it is that it is by what I have learned kind of silly and campy its more darker parts have been even played for comedy at times or meme culture. It is not as taken as serious of a Bad-Girl Wanda Turn cause of all the off screen, not following WandaVision, plot holes by the truckloads, not offering what MoM set out to be, Campy story elements, not well put together of a story, so on.
What MoM did most importantly most of all that is WAY Better then the Alternative is that is BURNT-OUT the Bad-Girl Wanda Story-Plot we have all been so worried would come to pass. It burned so hard, so Campy, and so over the top while having a 3-Act-Structure to it, it truly has played itself out now.
They really can’t go back to it for her, doing so would be obviously repetitive and even would anger fans that liked MoM and would put Marvel Studios in even more of the Controversies house by been seen as not learning their lessons of how to respectfully use Female Leads with Power and be called for permit Sexist and Misogynistic. It would just be the embarrassment of all embarrassments to try to continue the Bad Girl Wanda Stick.
So This gives our Wanda a chance, now she is still Red-Hot and is still mostly loved by the majority of fans, given support to see her comeback, fix what went wrong and have Solo projects of her going forward, the desire for her to have this seeming to outweigh any other characters in the MCU right now.
So yea while MoM is not by far what we Wanted, it has taken away likely finally the Bad-Girl Wanda angle for good and saved us in a morbid way from a far worst scenario with the original plan.