So , what kind of pack weights did they carry back there on the African plains? And what kind of rocky, stepped and switchbacked trails, talus and scree did they climb, and descend, 15 or 20 miles a day for three weeks to six months?
I'll pile on some more...
They did not even live long enough to wear out their feet, or it did not matter anyway. (Got eaten by lions or killed by next door neighbors, died of malaria or precursors to HIV and Ebola). They lived long enough to reproduce (14) and did not make it to most PCT-er's age.