It may not have been intentional, it could have been someone rubbing it against a rock out of boardom or trying to start a fire with it then realising it was po

It may not have been intentional, it could have been someone rubbing it against a rock out of boardom or trying to start a fire with it then realising it was pointy. In that case it was a discovery, not an innovation. We may have had a very suboptimal way of doing it for centuries while the process evolved. I'm sure a lot of people here have stories of their pets confusing cause and effect.