I beg you, if you are a developer of an open source app or program - add screenshots of your app to the README file. When looking for the perfect app, I had to install dozens of them just to see what the user interface looked like and whether it suits me. This will allow users to decide if the app they choose will suit them… Please, don’t think about it, just do it…
I think it depends on the project. Some projects are the author’s personal tools that they’ve put online in the off-chance it will be useful to others, not projects they are really trying to promote.
I don’t think we should expect that authors of repos go too out of their way in those cases as the alternative would just be not to publish them at all.
Totally agree