I love not being bombarded by ads thanks to pihole and adblockers. I don't have cable TV either. But without browsing netlifx/Hulu/etc. how do you actually find stuff to watch and discover worthwhile shows and movies to rent from my library?
The 'arrs handle actually finding/managing media files
Overseer/Jellyseer/Ombi are interfaces for you and your users to request media to be added to the 'arrs. Either directly, or after approval by an admin.