How does the naming scheme for anime work on Jellyfin?

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I believe you're correct, the naming conventions call four uniformity for the most part. You can't have some season folders and not others for a show. The tvdb ID is listed as a tip in the Jellyfin docs. The rest of it is preference for me. You can ditch whatever you like, however, I like this setup for management purposes as well as re-/encoding. It's a clear indicator of processing, makes it easy to see at a glance whether I've brought media in line with my standards, and also can help in case I make a mistake somewhere along the line.

I'm being vague as to not further any verboten discussion. There's a difference between "to spec" and functional in this case IMO.