More ambitious projects need a certain critical mass of resources behind them. Ancient Egyptian civilization built a large irrigation system to make the best use of the Nile floodwaters for agriculture, a feat that would not have been possible to a small tribe or chiefdom. This doesn't mean people, we're no longer bound by labour intensive solutions. I live in a single state with a tiny population that mines and ship…
We are still bound by labor amount, but now it's mostly the intellectual labor. The amount of thinking happening in the world depends on the amount of human brains available, and their level of education and knowledge, in the widest sense. Solving current challenges faster is often only possible by applying a larger amount of thinking to them. (No, the AI is not yet a game changer here.)
It's entirely possible that the economic reward for intelligence is decreasing. Up until 1920 or so, what employers wanted was physical robustness and reliability. There was a period when intelligence was prized, probably beginning post-WWII. That may be over.
Amazon's fulfillment operations represent today's corporate ideal - "Machines should think, people should work." They want physical robustness and reliability in their employees. Not original thinking.
[1] https://www.insidehighered.com/news/global/2024/02/09/few-st...
[2] https://www.bloomberg.com/news/articles/2022-04-18/is-colleg...