What's Wrong With Taking a Different Social Structure?

The umboti pigmies are, on an average, about four foot six inches tall. They have almost the exact same hyper gallaterian social ucture and cultural institutions as big and tall montagniniscapi foragers who lived in the coniferous forests of quebec and labrador. And they also have very similar social structure and values and institutions as the calahare bush people living in the nebibian desert. In the case of the societies that i just mentioned, it's what you do for a living in those environments that ends up generating the conditions relevant to favoring agaltarianism. All these groups do what is called immediate return nomadic foraging.