[MarkusQ]

Unfortunately, you also sometimes throw out explanations like "they did X in substantially the same way as their descents were doing X up until the late 1800s" or "they used it for Y, just at it was used at other sites throughout the world."

At least in the case of things like migrations, we're starting to get overwhelming genetic evidence.

[andrewflnr]

I agree that's an overcorrection. People doing things the same way they have for centuries should be high on the list of plausible, boring explanations.