What if the article has it backwards: I doubt that a random samples of same-aged people from a western and from a hunter gatherer society will end up with simil

What if the article has it backwards: I doubt that a random samples of same-aged people from a western and from a hunter gatherer society will end up with similar distributions of personality types. I'd guess that some traits (e.g. being very individualistic, competitive or narcissistic) might only emerge in more settled societies where wealth can be built up and inherited. At least Richard Rohr mentions this as anecdotal experience in his book about the Enneagram.