our earliest known writing
It's true. The records that managed to be preserved are usually atypical. They are lists of kings or royal lineages, otherwise they record transactions. Incredibly useful, but lack the human touch (if you know what I mean),
We are really lucky when they are actual correspondence or items related to day-to-day living. When I was running training courses on keeping records I would always try to bring in the personal perspective. A reciept for your credit card, or for rent, or the stuff you include on your resume are intensely personal and say so much about you as a person.