Typical piracy requires you to search sources/indexers yourself, decide on the best search result for what you're trying to download, pass that to your download client, then manually name and sort the downloaded files into media folders once the download completes.

The arr's automate this entre process for several media types (movies, tv, music, etc), combining search results from dozens of indexers to make its decision on what to download.

Now, I open a webpage, search for a movie/show (results from imdb) and select an item I want to watch. ~15min later, that item has been found, downloaded, and sorted into my media folders where Emby/Jellyfin can display it to myself or friends.

Add on to this with Ombi, a requests platform that allows my friends+family to request media and have the arrs automatically grab it. Since setting that up a little over a year ago, it's filled almost 400 requests (not including media I've grabbed/requested myself) without me having to manually manage requests ever.

Ontop of grabbing media on request, the arr's also monitor the sources you've configured, watching for new uploads, and grabbing content that's missing from your library but monitored for, such as: newly aired episodes, media that couldn't be found earlier, or upgrades in quality for existing media (if configured/allowed to upgrade existing media).

Every time a new episode airs for a show I've added, it automatically grabs it for me. (currently 486 series monitored here)