> that's why everyone abandons that lifestyle as soon as possible.

Not everyone, there are still societies doing that. The thing is, it doesn't scale. And the other ways of having a society do. Which, naturally, leads to a situation where the most of the population is not doing that, and keeps those who do that around just out of benevolent tolerance. It may even be a more pleasurable way of life, for all we know, than many others (such as one of a medieval peasant) but it can't ever be anything but a tiny minority.