> The presence of such graffiti adds color and texture to the civilization inhabited by Virgil and Ovid.

It does, but do you think that people at that time thought anywhere near as much about preserving their scribbles as we do?

I'd venture a guess that we've created more "content" since the advent of the internet than in all of human history prior, and most of it is stored on things that aren't even designed to last a human lifetime without failure.

The idea that we're going to save every piece of digital junk for posterity just isn't realistic or healthy.

> What's just disposable background noise to us may provide context into how we lived and thought to our far-future descendants.

You're right, but you're also assuming that they're going to care that much, and that we're going to survive that long.