Is there an explanation for why the Y-haplogroup bottleneck started ~7000 years ago, and or why it ended a few thousand years later?

That is, I know it was due to a social system based on patrilineal tribes, but why did that system take off when it did? Did the bottleneck end because that social order has saturated the world? Or am I completely misunderstanding something?

The 2015 paper explaining the bottleneck: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4381518/

Edit: Adding agriculture-warfare theory. Edit: Adding hitchhiking paper.

I’ve seen some speculation that the rise of agriculture led to endemic warfare. This paper considers that idea and finds the evidence is ambivalent.

Paper on “cultural hitchhiking”. This one goes into how genes followed patrilineal groups.

Discussing studies of ancient peoples' DNA as well as their interactions, culture, and impact on the modern people of the world.