Of course; the parent likely meant something more like "even if hypothetically there is a strong or very strong genetic component". It's undeniable there is one

Of course; the parent likely meant something more like "even if hypothetically there is a strong or very strong genetic component". It's undeniable there is one, but the responsibility is still hotly debated. I've seen claims between 20 - 90%. I think their point was that no matter how strong it might be, it often may not visibly materialize due to various environmental factors, including passive or active suppression and the way our societies and economies are organized. So assuming for the sake of argument it's 50% or even 90%, there are still a lot of reasons why such gifted people may not get recognized and/or reach their full potential. Ramanujan very easily could've died with almost no one remembering him if none of the letters he wrote were taken seriously. The first two mathematicians he contacted ignored him. If not for the third, G. H. Hardy, giving him a chance, we might not be talking about him. And even he initially suspected he was a fraud of some kind, until he scrutinized the work more carefully and shared it with others.