EX: Apparently, Einstein was an ok chess player and Oppenheimer sucked. Yet, chess prodigy's are often called geniuses even if that's the only thing there particularity good at.
Businesses, Language, Math, Music, Go, Chess, IQ tests, Poetry, Physics, Early development, and Sculpture don't really have all that much in common. In the end it's much more meaningful to say someone is a _ genius than simply calling them a genius because g is closer to a myth than reality.