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…
If the app sucks, few people will add the screenshots. Therefore, most apps without screenshots will suck. So new apps will need the developer to add screenshots, or people will assume it sucks.
And we’re back to square one. The developer has extra responsibility to highlight the features.