This is the most ignorant bullshit I have ever heard.
There is no innate understanding. Those guys were just interested in art from childhood, so they have way more practice than everyone else.
Children also develop differently, so some have a better developed brain to deal with the artistic abilities compared to other children at the same age, but at the expense of being underveloped in a different area.
The idea of "talent" is a fucking insult to all and every creative person out there who has worked their ass off to achieve commercial and artistic success.
Yeah, some people are less fit to do a thing, but those are the exception not the rule. We're all different.
The sucky artists you're talking about just doesn't have the passion or will to improve, they are content. It has nothing to do with any innate understanding, just motivation and will to better themselves, to devote time and effort into it instead of other parts of their lives.