In even the most remote places, society has leaned hard on individual roles over “do everything”.
When a ship landed in America and a colony was set up, people worked cooperatively and benefitted each other. As the colony grows, you end up with a butcher, a farmer, a blacksmith, etc.
Specialization reduces self-sufficiency, but benefits society.
As for the “truly self-sufficient”, they are useless to society, and do not move the species forward in any meaningful way.
No one in America can mine ore, smelt it, and make a TV. Or penicillin.
We are surrounded by success stories of “society over self-sufficiency”, and only rarely hit with situations where being able to handle-everything is valued. And even those uncommon situations are fleeting.