If you think individualism isn't rampant elsewhere, you need to travel more.
Individualism is a core feature of capitalism and the enlightenment. Group identities are cancer and although not a requirement of, parliamentary (democracy) emerged precisely with capitalism and the individualism it requires.
Ancient Athens, the Romans, and the Phoenicians would seem to disagree.
It’s why I said it’s not a requirement of. But Feudal society was toppled by capitalism which was powered mainly by democracy.