Their point regarding old and unmaintained apps seems a bit silly. Getting the same old and unmaintained app from the app’s website isn’t going to make it any safer. You’re still going to need to switch to a different app/fork to get updates.

F-Droid doesn’t usually remove apps that aren’t maintained, as far as I can tell. There are apps that haven’t been updated in over a decade (Quill). Since F-Droid sorts by recency of release, they tend to just sink to the bottom of searches anyway.

Semi-offtopic, but the one feature I wish was more common is (good) equation support. Whenever I try to use a new word processor, no matter how great, I always find myself crawling back to LyX for anything with maths.