Mariner, I am typing this reply with a hand bearing a thin scar that drives gypsy fortune tellers nuts. I had the dubious honor of slicing said hand on a Clovis point in Wyoming, a tool use far from the maker's objective. I have witnessed many debates over defining recovered artifacts as knives, scrapers, awls or even pottery in California ( it was an abandoned skeet range overburdening a Chumash site.) I leave the debaters to go blind peering at microlithic marks under a microscope. 30 minutes with a road kill carcass explains a lot of tools. What we might call a sawbacked blade did indeed work well making grooves, as does the USAF survival knife ( and just right for paracord.) I am not dismissing the concept out of hand, just trying to explain the limitations.