Staying in the jungle for a few thousand years leads you to optimize locally sourced flora and fauna to amazing levels to solve a range of medical conditions. That could be helpful to a lot of people in many social and financial conditions.
Do you have a source to back that up?
We weren't always taking asthma inhalers from Walgreen for the several thousands of years of our existence on this planet.
You seem to asking for proof that humans for all these thousands of years of existence pre industrial revolution needed some kind of a health care system to survive.
There are some things that go as an axiom.
The only exception is diabetes, because that's easy to spot by looking for sugar in urine.