This is a very valid concern. Pirahã is super isolated, culturally, linguistically, physically. There are a few hundred speakers deep in the Amazon. Everett is

This is a very valid concern. Pirahã is super isolated, culturally, linguistically, physically. There are a few hundred speakers deep in the Amazon. Everett is _the_ world expert on Pirahã language (second is likely Steven Sheldon), pretty much everything on the subject is viewed through his lens. As I understand it, it was only the past decade or so when others have really started publishing on the subject in ernest. And even Everett didn't catch the bilabial trill affricate till 2004, like 20+ years in to his research.