The qualities of independence and resilience appear to be intrinsic to each individual, not tied to any particular economic circumstances or any particular time in history. My young wife taught for 30 years and had the opportunity to observe thousands of children, and she and I had this discussion many times.
Yes, there are parents who have both the economic means and the parenting style to cushion their children against any and all life setbacks. Initially, I would have thought that would produce weaker children, but there were many of my wife's students raised in those circumstances who became strong, independent and resilient adults. Conversely, there were some of her students who came from the poor end of town, whose parents had neither the money nor the time to coddle them. I would have expected that the struggles they experienced would have made them tougher and more likely to push on to success, and that certainly was true for some. But others appeared so beaten down by life that they could not imagine anything better and were passively accepting of deprivation and misery.
In short, there was no particular way to tell how the students would end up merely by observing their parents' economic circumstances or even parenting styles. Equally, there is really no way to generalize to particular generations. There have always been rich and poor homes, struggling and comfortable ones, and demanding and lenient parents. And their children have turned out to have a wide range of independence and resilience.