Yeah complex issue but I definitely think it's become more of an issue in a highly specialized professional service economy. In previous structures maybe you were dependent on growing food and there were harsher consequences which would have been motivators. Or even in recent history, well paying jobs that required physical labor and little education. We know people in the past exhibited all kinds of issues, but the language used to describe is often hard to translate. They wouldn't just not know adhd exists, but lack the understanding of the mind to even quantify disorders like this, and there would be an entirely different set of concepts and language.