I agree that “cooperation” isn’t the perfect word. What they really mean is that east asian countries are good at large-scale projects: rice farming back then, building high speed rail today.
But westerners overlook that east asian societies, specifically China, often tolerate openly self-interested behavior: pursuit of personal advantage, or advantage for one’s family, without regard to others. There’s a funny Ronny Chieng joke that east asian mothers want their kids to be doctors, but view “helping people” as an undesirable consequence of the job.
By contrast, we think of westerners, and Americans specifically, as highly individualistic, but many subgroups of Americans have a high level of self-organization. They’ll make and socially enforce rules without anyone telling them what to do.
For me, it was finding a lot of my American friend’s grandparents lived in nursing homes. That really shocked me, since just about everyone I knew in Taiwan lived with their grandparents.
The other one was learning quite a few of my American classmates had to pay their own college tuition. Not because their parents couldn’t afford it, but simply because they were seen as “adults” so were on their own.
There were other periods also of disunity in China, and consequently tons of people ended up dying as well. I'm sure it's similar with e.g. Japan where they had their own "three kingdoms" period.