I think you are too comfortable casually dismissing a cultural behavior that has existed across different forms for millenia. Perhaps there are interpersonal,

I think you are too comfortable casually dismissing a cultural behavior that has existed across different forms for millenia. Perhaps there are interpersonal, cultural, body-language, psychological, and other ways that this behavior is important to us, and your certainty at its unimportance seems out-of-proportion to its continued prevalence and an over-estimation of the quality of the possible completeness of your analysis.