I just now noticed this. Why not contact me if you have questions, or at least point me to your post? I don’t automatically hear anytime someone mentions my name, after all.
Yes, the idea is that we value stuff about our culture that will be lost if it is replaced by other very different cultures. People in the Roman Empires who liked its cultures should have wanted to prevent its fall and replacement by the Christian culture.
Why talk about an outside view then? To get you to see that your culture is threatened from the outside.
Our best models and data do say that innovation rates would fall with population. https://www.overcomingbias.com/p/how-much-more-innovation-before-pause