[agumonkey]

I'd add one argument about art: living in a "primitive" state full of unknowns promotes imagination a few orders of magnitude.

Another one: I make a parallel with pre-tooled humans that these people long ago were living on a thin line and had to be extremely lean and yet wildly efficient all the time, you don't have much time to craft a spear and it better be lethal when you finally approach a prey. And you do this with your hands. It looks as stupid as senior writing a few lines of code and looking dumb when it fact it's 80% right the first time.