Correlation/causation - dining together doesn't cause all those benefits, it is simply correlated with them. There is probably a common factor which causes all

Correlation/causation - dining together doesn't cause all those benefits, it is simply correlated with them. There is probably a common factor which causes all of those behaviours, probably something to do with education and wealth (although working out exactly what is a bit too much science for a back-of-envelope estimate). Nonetheless, your fundamental criticism of Soylent is probably still valid (even if the target market isn't families.)