Can someone tell me what is the appeal of *arr apps? I'm not a hoarder or professional movie/show watcher, why should I set up what is basically a glorified "periodic metadata downloader with a tiles UI"?

I tested radarr and readarr recently. Didn't find out why people use them. Like libgen was better than readarr and I couldn't even select the encoding/file size of a movie title in radarr (there are some predefined profiles and you can define yours too but I expected something waay too simpler to do this. Like if you select fhd, it may download a very large file. You have to manually set the bitrate slider for all profiles, but then you may risk losing some available item if the release is very new and not encoded. I mean the UX was confusing)

And I see people host yet another tiles UI (Plex/Jellyfin) on top of that just to show a folder structure with pretty thumbnails? Each one of these apps is usually written in C#, taking ~300MB of RAM mind you...

What would help me is simply a search box that crawls all available torrents and presents rows with filtering based on size and encoding. I tested prowlarr for this but the UX was poor.

I must be missing something very obvious here.