How is that different? We have an upper cognitive limit on how many relationships we can track. How is that different from what I said? Pretty sure my brain (and a lot of other humans’ brains) run up against that limit on Facebook all the time. We befriend thousands of people and then can’t remember who in the heck these people are a few years later. Regardless, my brain can’t handle relationships with 7.5 billion humans. Can yours?