[WorldMaker]

I just went "nearest ancestor up the stack" as a short hand, because the evolution of languages is a huge tree and a lot to talk about. If we want to get into it deeper, Proto-Indo-European had some truly fascinating grammar cases from what we think we've reconstructed of them. Most of the stuff that PIE did seems like "natural laws" simply because of how many modern languages we regularly see branched from it and how deeply rooted a tree in the language forest it is. But then we also have had chances to study non-PIE rooted languages and the "universals" are fewer than we think they are.

[brokenkebab2]

I mentioned history of numbers, and it starts not from PIE speaking peoples, so I'm a bit lost as for what exactly is your point.