I would at minimum want to see the analysis replicated across a variety of languages before I started drawing conclusions about "the primordial nature of human

I would at minimum want to see the analysis replicated across a variety of languages before I started drawing conclusions about "the primordial nature of human language". In particular, languages with no known relation to English; Chinese would be a good one, far from the Indo-European tree and with a big corpus. The membership-centric is certainly appealing, but really it's too appealing to let ourselves take it seriously without counterbalancing it with a high standard of evidence.