Thanks!
My response would be that this is the challenge of science: figure things out even if you have to be very clever and look around the corner.
Like they got a clue about when humans lost their body hair by looking at the evolutionary history of lice.
https://www.floridamuseum.ufl.edu/science/human-pubic-lice-acquired-from-gorillas-gives-evolutionary-clues/
I imagine some sociologists have had clever ideas too on how to tease out data that's difficult to obtain. But maybe I am too optimistic?