Case in point, I recently wrote a CLI to show which of your AWS infra is not captured in terraform, and you can either print the result as a json to consume by a machine or generate a dashboard with some charts. It took me an embarrassing while to realise that I should have included a damned screenshot in the README, in fact I think I only realised when I wanted to show it to my brother.
Which is a bummer because it is a complete different point of view from the more typical user experience
In many cases the repository isn't meant to be more than for source code too, not everyone use their git repository as also the marketing page, that'd go somewhere else.
With that said, grapheneos.org doesn't seem to have any screenshots either, which I also don't understand and think is a bummer. Even though the point of the differences with GrapheneOS might not be mainly visual, just showing what it looks like seem like a no-brainer.
It's like we've had this ancient knowledge passed down for generations but people constantly just ignore it.