If an unintrusive privacy breach of that small group was likely to allow us to learn something that would improve the lives of 7 billion others, it ought to be made. Just do the math.
I don't think there's likely to be that much we can learn which would actually be useful, but that ought to be the test.
My understanding is that the only thing we'd learn is more about how early tribal systems might have been, which is of academic interest to Anthropologists, not of general value to every day people.
I am known to misunderstand though, which is why I'm asking if there is something we think we can learn from studying them that would apply to all people.
Well, I guess I answer my own question here, but we don't know that they survived because of their observation of the nature. We don't know enough about them to say that. They survived, how or why, we don't know. Knowing how or why may be of interest to Anthropologists, but there's nothing indicating that it would be generally useful for all humans.