I think I hold the same position as Graeber, I was just keeping it simple.

For example that's partially why I said "all" tribes. I agree that it didn't happen linearly, and agriculture wasn't adopted by all groups at the same time. As Marx pointed out late in his life, many tribes had instead adopted a proto-communism that didn't derive from a local implosion of the capitalist order. However the exploitative form of material relations has nonetheless become dominant over the course of millennia. It is obsessed with subjugation and highly normalized. Therefore I think preventing its instances of origination would have led to the development of very different civilizations.