Hear me out on this.
In Chamber of Secrets, we learn that Harry can speak parseltongue because Voldemort can speak parseltongue. Dumbledore believes the former Tom Riddle transferred some of his power to Harry Potter when he attacked the Potters 12 years prior. Later, of course, we learn there’s more to it than that (classic Albus), as Harry is actually a horcrux.
But what if all of Harry’s considerable powers actually came from Voldemort? What if Harry were born a squib, and can only do magical things because of his first brush with the Death-Eater-In-Chief?
I know Harry does magical things after the horcux within him is destroyed, but we could certainly imagine a sentence or two of exposition dealing with residual magic and so on. It’s not necessarily elegant, but it’s no midichlorians.
And it makes for a more ironic, tragic, and better story in the end. Had Voldemort failed to attack the Potters when Harry was an infant, Harry never would have been able to defeat Voldemort in the late 90s. Voldemort would have risen to power unchecked. This makes James’ and Lily’s deaths absolutely necessary to the story and to the survival of the entire wizarding world, putting even more weight on Harry to ensure they didn’t die in vain.
Doesn’t that make a better story?