this applies to every job, not only management. If you are not a natural talent, there's a limit to what you can do, regardless of the effort.

I'd say that's not true for most jobs. For jobs which are an extension of a hobby such as sports and programming, there's truth in that. If you've been living and breathing the hobby since elementary school because it's what you love then yes, you have a big advantage over someone who starts doing it in the university as part of formal education.

But most jobs aren't like that.

For instance nobody is a natural at something as unnatural as cutting open someone's heart and stiching it back together succesfully. And nobody is doing that in elementary or high school. It's an unnatural skill you can learn only by applying yourself in medical school and if you work and study hard at it, become a heart surgeon.