You must not have been much of an Austrian if you didn't even grasp the basic point that individualism has nothing to do with isolationism. Also, it's a simple correlation-causation fallacy to claim that rainforest tribes are not advancing because they are anarchistic.
I wrote nothing about isolationism. I wrote:
An 'individualist' life is possible within a collectivist, materialist society only. Beyond the collectivist society, within the stateless
community, there is no individualism.
Self-sufficient rainforest tribes are not advancing and producing surpluses within 1 million years, because they are
not forced to produce surpluses (for the church and state mafia). To be forced is the only evident causal reason to produce surpluses. No state = no economy, no business.
Utterly ridiculous.
People produce extra because it's in their interest to do so, so they can exchange it for other wanted goods or invest it, etc.
The nation-state actually circumvents this by siphoning off the extra production, reducing incentive to produce extra, since you won't get to enjoy it nearly as much, since they take it from you.
You are story-telling. Go out and check. A socialist US-Citizen produces hundred fold the amount of that, what a stateless tribalist does. A stateless tribalist is not growing economically, because he is not as stupid as the collectivist capitalist, who is producing rampant growing surpluses like mad.