The shaping of sharp and pointed obsidian scales was not an easy job. It required a lot of work and sometimes, just before their completion, they could be ruined by a wrong last strike. They then had to be thrown away, causing great frustration to the maker of the tool. Except of course if the splinter could still be used to make another tool of different shape and use. That skill was something that could be taught only by doing and not so much through oral instruction. So, it was a skill that the older members had to impart with pain and effort to the younger ones. But certainly, those Homo sapiens could more easily create more practical and more specialized tools than the ones made by the Homo erectus. That was the Moustier period of the human civilization.
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