I use the *arrs to make a well named hard link to the file in my media library right after the download completes. Then they can be removed from the torrent client after appropriate seeding time/ratio.

Because deleting the torrent doesn’t delete the file?

Lots of people don’t have the storage space to keep every piece of media that they download. Once it’s been watched or listened to, it’s deleted.

Depending on the torrent, it’s faster to consume it than to seed it.