Friend of mine is big and he is around 6ft but long fingers and toes. Curious if that is a factor.
I think that fingers and toes, hands and feet, ears, nose, height all fall into the same bag. None of them are really indicative of anything else. Sometimes people might have some of these features, but others that conflict, like big feet and short, so how could you know which feature to trust.
You could say that things are proportional, and that is probably sort of true. But if average height is 6 feet tall and the average penis is 6 inches long, the proportionally, someone who is 6'4" is going to be less than half an inch longer than average. But we know that people who are 6 feet tall run the gamut from very small to very large, so we have to assume that the same is true for all heights. Maybe the height can skew the range slightly, but it is likely not in any statistically significant way.
I still think people just think that being tall is an attractive attribute, and penis size isn't really a factor, at least not realistically.