I know this suggestion is already a bit dated.
Do you see this actually covered with the new Plex TV Series scanner having an option to download season names from The Movie Database or TheTVDb. I’m aware that based on the policies of those repositories, you can actually end up with anime that are spread across different shows instead of named seasons (e.g. Ghost in the Shell SAC vs. Arise) – though from what I’ve seen most shows where different arcs are grouped by their own names are actually represented as seasons of the same show.
