The post appears to be an overall response to the idea that modern society as we know it is "just how it is." The point isn't "be like our ancient ancestors" so much as "the system we have now isn't the only way things can be." That is, we've all grown up in this society with the work grind as our default. Some people will defend the way things are on the basis of it being some aspect of "human nature" to always compete and work hard, but societies of the past survived through co-operation and sharing resources. It's pretty much the opposite to what is expected today.

What's a valid argument in favor of today's system? Wouldn't that be a recency bias?