Very interesting. That reminds me very much of the Ice Age exhibition and lecture I went to at the British Museum, particularly the massive and wafer thin spearhead which you may recall too Moss? The curator was talking about symmetry in the lecture, it's something that our brains find pleasing isn't it. Your article says " they were more symmetrical, more finished and made with more expertise than was needed for the job." (Could it not be though, that it IS needed for the job to some extent? It's not much good having a totally wonky arrowhead or axe, is it really going to be as good at the job?) And if you're not in a terrible hurry, and you've got the skills, you'll want to produce something decent looking for your own satisfaction I'd have thought. Form and function but with a bit of human psychology and instinctive appreciation of well crafted, well balanced, easy on the eye object too? Also then you get some status, and the object gets some status. And as with that big spearhead, it becomes more of a symbolic object, not something that you'd use, because you've actually made it too flimsy to use. It's become a beautiful object in itself, a piece of art I suppose.