Developed into what? The hunter-gatherer bands still roaming the Amazon don't have to worry about unemployment, layoffs, crime or a host of other maladies - their only problem is encounters with murderous gold miners from the "developed" world.
Sociologists found hunter-gatherer bands usually work less than 40 hours a week. They have it made more than Amazon SWE's grinding away on the weekend.
The past 10,000 years of "development" has been a disaster for the majority of people, and a benefit to a small minority.