Continuous written records beginning in 4,000BC? For the world, or for one corner? Which corner has been keeping continuous records for that time? The Assyrians? The Hindus? The Tibetans? China? What did the continuous written records of life in Africa tell us? Life in the Amazon basin? We sure don’t have 3,000 years of continuous written history from Europe, or Australia, or Russia, or North America.
Not seeking to bash anyone, but the gaps in our knowledge of human history are many, and span millennia; like I said, let’s not outrun our headlights.