basically: humans can totally interact in 10 x O(50) communities despite being utterly unable to interact in 1 x O(500) community. That's really the same lesson as scrum teams too, just at a different scale.

human empathy and working set is totally limited by team size and cache level, you need to optimize for facing the same problems/interests as the person next to you.

Families/localities/regions are the cache layers of empathy. And I'm using "family" broadly.

"Contextual communities" I guess.