Some of your claims about the EEA are counterintuitive to me. Basically, it's not obvious that all information not strictly private would have been public. I'm thinking, for example, of present-day isolated cultures in which shamans are trained for several years: surely not all of their knowledge can be produced in a publicly comprehensible form. There must be a certain amount of "Eat this herb -- I could tell you why, but it would take too long to explain". Or so I imagine.
So how much of your description of knowledge in the EEA is your guessimation, and how much is the consensus view? And where can I find papers on the consensus view? My Google-fu fails me.