I don’t understand what you mean by “discoverability”.

If you mean things aren’t scraping correctly you can override the incorrect scrape by clicking the three dots on the right and selecting “identify” in the webui.

Placement varies a bit depending on platform and obviously if you’re using custom css (I’m not) it changes things a lot. This brings up a custom search ui, enter the show name, click search, will return results, select the show that actually matches, click next, refresh metadata (and make sure to refresh images if the show was incorrect).

Of course if this is happening consistently read the Jellyfin docs regarding naming and folder conventions. This is one of the appeals of sonarr and radarr - they act as a precheck to ensure everything is compliant with thetvdb/moviedb, can create the proper folder structure, can rename files according to scraper guidelines, etc. if you have them set up in sonarr/radarr correctly and let them rename/manage directories Jellyfin will scrape correctly 99% of the time (sometimes it has a weird error with niche content even if it’s correct but the above trick fixes it 100% of the time in my experience).

If you mean just sorting things I have anime coupled in tv, I don’t see the point of splitting it away. It is fairly uncommon to find anime that is not in thetvdb at this point unless you have a sizable library of non English translated anime, and if that’s the case it’s still best to keep it in tv shows with anidb or whatever as a backup manual scraper (keeping it on for auto scraping will result in western shows getting a ton of garbage data in my experience, just manually scrape series that don’t work). But it’s rare even then, I (poorly) speak Japanese and have a decent library of anime that’s untranslated and far less known in the west and 85% of it just scrapes, maybe more.

Outside of that custom libraries for things that don’t “fit”: music videos, youtube videos, workout videos, etc. most of this stuff needs handwritten nfo and custom metadata tho.

Music videos have imvdb but it’s not very well managed. There’s just massive stuff missing and the model for how it works is deeply flawed. I submitted a few videos to be added a year and a half ago and logging in now they’re still sitting in the mod queue. Imagine if musicbrainz or discogs needed a 1.5yr+ moderation queue instead of just letting the community at large police things, ridiculous. We’d still be stuck on Beethoven

I also override movie titles so that they organize properly. Horror franchises where they are sometimes numbered and sometimes not is the main example I can think of. You can do this via the metadata manager in the admin panel. You change the sort title and leave the display title alone. Then Friday the 13th: the final chapter can be parsed as “Friday the 13th 4” and will be displayed in the correct order, though you have to do the entire series (especially bc they canonically did “part 2” and then “part III” which makes sorting awful. Then ones called “Jason goes to hell: the final Friday” but that isn’t the last one. Terrible)