Brains rewire all the time. It's our number 1 feature, adaptability. A good musician can become a good sharpshooter, a good programmer can excel at architectural engineering.

Being a good writer - what does that mean? Someone who has had some real, interesting experiences may be a better writer than someone who is wired to tell good stories.

Physical features also matter - a lot. Your brain may be perfect for a nuclear physicist, but you're no good if you're gonna have a stroke or heart attack suddenly on the job.

And, of course, nurture over nature - people's background, how they grew up, how they were educated from their first year to now, matters way more than genetics.

If you don't/can't account for all of that (and more) when deciding a person's future, then keep this science to yourself.