Because a shared cultural identity is vital to maintain a cohesive society that can muster the collective resources to get shit done?
The world is shaped by psychology and the actions of a very very few individuals at the peak of their respective societies. Material conditions merely enable success brought by cultural motivation.
Your argument really only holds water if you consider all humans to be fungible worker drones and that culture doesn't exist. The human factor is the critical factor in all of history. Material wealth does not magically produce innovation. The Romans could have started the industrial revolution a thousand years earlier, they had effectively unlimited resources. They simply lacked the cultural spark to pursue that line of research and industry. They even literally invented a steam engine a thousand years before modern times.
The world is shaped by psychology and the actions of a very very few individuals at the peak of their respective societies. Material conditions merely enable success brought by cultural motivation.
Your argument really only holds water if you consider all humans to be fungible worker drones and that culture doesn't exist. The human factor is the critical factor in all of history. Material wealth does not magically produce innovation. The Romans could have started the industrial revolution a thousand years earlier, they had effectively unlimited resources. They simply lacked the cultural spark to pursue that line of research and industry. They even literally invented a steam engine a thousand years before modern times.