I think that's why PG's discussion of whether and how a motivated individual can change or enhance these attributes is interesting, along with the observation that strength in one can make up for relative weakness in another.
I think your analogy fails in that hanging out with tall people can't make you taller. Exceptions to general rules are interesting, but don't have much predictive or explanatory power.
Analogy (because I love analogies): “Seems like people over 7 feet tall make great basketball players.” This is great but it’s much more interesting that a guy named Muggsy Bogues made it to the NBA at 5 foot 3 inches.