I agree with your premise, but writing things down is not "better" but "different". Oral histories have a strange rapid way of evolving by only preserving structure that matters to many and contributes to fitness of many. Cultures that didnt know how to transmit the "right" parts of oral history, they ceased to be that same failed culture, and became another culture made of those new stories.

Writing locks in and requires the evolution of other forms of evolution, as the Word can no longer evolve during transmission.

I say that while being firmly on your side in the larger back-and-forth exchange here :)