I'm very picky about what I install on my phone. I find screenshots really aid me in whether I'll like the app or not. F-Droid is completely lacking in screenshots for most of the apps listed. I know this is mainly the app authors fault (this is also a problem with all FOSS software in general I find). If they made more of an effort to even upload one screenshot to F-Droid or the Git pages then I'd be more inclined to try their applications.