A decent bunch of the apps on F-Droid are woefully inadequate or still early in development. At the moment F-Droid allows sorting apps either by time of most recent update, or alphabetically. Neither of those is actually useful to me as user.
If there are multiple apps doing the same thing, it is currently incredibly hard to see which one is the best. I do not want to download and install multiple apps only to find out they are essentially unusable, and that of the 5 options only a single one is actually functional.
I understand that F-Droid might not want to go all-in with the rating and review system, but a barebones download counter would at least show some indication whether people install it once and remove it after trying it out, or leave it installed long enough to survive multiple updates.