> A very simple example for height[1]: The Japanese grew 10 cm taller from mid-20th century to early 2000s. Originally people thought that the shortness of the Japanese was related to their genetics, but this rapid growth (which also correlates with their improved economy) suggests that the group difference between Japanese and other groups was not related to the genetic component of height variance.

Every group grew taller as they got richer, but Japanese people are still short even today when they are rich. So existence of other factors doesn't rule out the genetic factor.