«In documenting a change in stone tool technology, we likely document the start of greater regional adaptations among some of the first hunter - gatherers in North America.» (sciencedaily.com)
My guess, FWIW, is that there is a lot of cultural (and perhaps even neurological) development going on between the first «anatomically modern» humans 200,000 years back (and, according to recent finds, now further back than that) and the «Upper Paleolithic,» which is the period ~ 50,000 years ago when we start to see differentiation and development of stone tool technologies in the archeological record: (realclimate.org)
Thus, «giant chunks of space debris clobbering the planet and wiping out life on Earth has undeniably broad appeal,» Meltzer says, whereas «no one in Hollywood makes movies» about more nuanced explanations, such as Clovis points disappearing because early Americans turned to other forms of stone tool technology as the large mammals they were hunting went extinct as a result of the changing climate or hunting pressure. (sciencemag.org)