Why would I add indexers to this app?

As I have Sonarr/Radarr with indexers, when I search via this app for files I get a full list of Torrent/SAB files without issue.

Perhaps my setup required no need of it, just curious though, perhaps if I used it I could get benefit :)

Sometime you want to look for something which isn't a tv show or movie.

You would do this by searching your indexers or index amalgamation service.