I can’t speak for others but for me it’s about the “technology “ at the time & the population of the Americas. The mythical white buffalo so to speak. Yes I have read & believe in pre Clovis sites.
I guess it’s the 1st distinguishable culture on the Western Continents . It’s a very difficult tool to replicate, but it must have had an advantage over the point types at the time, otherwise why would they take the risks in fluting .