I'm not sure that statement is true. Given just one OR the other, which would you pick? Graffiti, or random chatter/expression by extension, is useful as an ad

I'm not sure that statement is true. Given just one OR the other, which would you pick? Graffiti, or random chatter/expression by extension, is useful as an addition to privileged writing which serves as a backbone to the events of history. Without the latter, the former isn't nearly as interesting. Take Native American culture for example. If we could, we would prefer actual historical events written down than just stories that's pass down through word of mouth.