"the development of division of labor along craft lines, the establishment of regional and interregional trade systems, and the emergence of commerce as a separate profession."

In the book 'The Unsettling of America' Wendell Berry talks in great detail about this subject of specialization (although he doesn't explore how far back that system goes, he is pretty much comparing the U.S. with Old Europe), which has the illusion of putting people who are the best at a certain trade in charge of that trade specifically, without the distractions of other things, but of course actually makes people so specialized in their one job that they don't know how to do anything else, and consequently are dependent on all the other specialists to do each little thing for them.
Entertain them (television), feed them (packaged or pre-prepared food) educate them, educate their children, take care fo their health, clan their homes and so on.
For a community to be formed out of members of the Taker or modernized societies, the group would need individuals who specialize in all the needs of the group, or town. Each town must have a doctor, a restaurant, a school...and so on.
A community of Leaver, indigenous or orginal people just needs a reasonable amount of people, enough so the labour is 'made light by enough hands' but not so many that it exceeds it's 'carrying capacity' (the level of population an environment can safely support before disease, food shortages, battles and collapse)
War, greed and disease are not inherint aspects of humanity, they come from centuries of genetic conditioning that there is not enough resources for the population of the community, so people hold onto what they can to survive. A situation which comes from actually having too high a population for the resources available, not the other way around!
And so, in the Taker society, there is this feeling of a constant need for expansion and getting more and hoarding, more land, more space, more resources, always expanding. Sometimes ahead of their own population expansion, sometimes behind, but always fueled by it. Though of course both the expansion of the population and need for resources, and expansion of resources in preparation for the growing population fuel eachother in a vicous cycle.

Also i like your point about how trade and 'imports' has existed for a long time, but was not necessary for life. Everything people need was and is still in the immediate environment, but some special things like foods from far away could be a treat, or tools or clothing that would last.
These days, most food eaten in the states is imported from somewhere far away. Even if it is 'grown in america', the U.S. is a big empire posessing a lot of land, and is ever growing!