F-Droid will soon have stricter requirements for apps showing up in the "Latest" tab in the F-Droid app:
https://news.f-droid.org/posts/2019-03-26-the-latest-tab-now-highlights-good-descriptions/
If you are an app developer consider adding good descriptions, screenshots and a "Whats's New" section for your app.
If you notice that your favourite app doesn't fulfill all these requirements consider notifying the app's developers or just help them with a merge request adding the missing info to the source repo.