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I think everyone would say that the I-function is necessary. Although instinct serves most people well in situations such as running from a predator, most people do not spend a majority of their time running away from a predator. That is the change that I see; most humans are no longer required to act and think to just barely survive. Technically, I do not have to be in school to survive; I could be working to make money for food and shelter. The advances in social organization have taught me that if I go to school then I will have a higher chance of being able to provide food, shelter, etc. in the future. Perhaps all we care about is surviving, but it is not surviving the wild jungle of strange animals but survival of other people. Since we have rules on social behavior (i.e. murder, revenge, etc) our definition of survival is not the same as our caveman definition of survival.