That is first (and consistently) exemplified by his attachment to his mother. The attachment to his mother as a kid is the entry point into this idea and the formative aspect of his character you’re describing. The way he chose to build in a “fatal flaw” that leads to his turning in Episode III was to decide that what would turn him into a control freak was losing his mother; which is why he got de-aged in Episode I, because he wanted to make sure that initial trauma was so strong. Again: He arrives at a bad idea, then comes up with worse ideas (why can’t she just come along? Because Jedi take kids, because they’re a weird cult now, oh, and she’s also a slave. Why can’t jedi free slaves? It’s not their job. etc. etc. etc) to justify the initial bad one instead of just CHANGING THE INITIAL BAD IDEA.
Of course, this gets confused by all the “prophecy” stuff anyway, but the character didn’t NEED to have a “fatal flaw” in the first place like that. He decided to root his control freak tendencies in losing his mom, which became losing his wife. But it never needed to be rooted in losing his mom at all - and if he wanted Anakin to be a control freak, there are other ways around it other than mommy issues that then get transferred onto his wife.
Lucas hemmed himself in and then kept sewing anyway.
Star Wars, from the first movie, has a throughline of parental connections and issues with that. So, no, I think his attachment to his mother and his attachment to his dad figure is necessary, to me, from a character, story, thematic and throughline level.
As I said above: I think Anakin being introduced as a child is apart of the contrast of what he will become as Vader, so I think it’s apart of the story and character journey, as well as him being a child, in connection to his relationship to Qui-Gon who carries the potential of a dad figure that Anakin never gets to have, that Obi takes on responsibility for, and Palpatine ultimately usurps. All his relationships, except Padme, benefit from him being a child in narrative. Not just his mother, but his mother is what I see as the start of it. His relationship with Obi is only an issue based on interpersonal writing issues in TPM, not based on the idea of Anakin being a child as a whole to me, his relationship with Obi as older/younger brother type of dynamic I think speaks to Obi’s feelings of failure about him/responsibility for him and love for him, and his relationship with Qui in seeking a dad figure that he loses that Palpatine usurps in connection to Obi’s I think not necessarily strong fitting in that role to carry the weight of Vader’s ultimate turn against Palpatine.
And I think taking out him being a child in TPM strips a complete weight framework of a narrative that travels from the PT into the OT, as, to me, it shows Vader being the personal dad he never had in choosing to die to rescue his son, and not only overthrow his longest oppressor in Palpatine, but also reject fully the emotionally manipulative dad figure (his basically abusive dad in this case I think) that he’d been living with his whole life. The whole story for Luke is in connecting with his dad basically in the OT. By doing what’s done in the PT in Anakin being a child, I think this adds to that idea. On top of paralleling how Vader and Palpatine tried to turn Anakin.
I think you never really say why this idea is actually bad to me.