I don’t know whether Plex uses ffmpeg or taglib to parse audio metadata. Since the current database does not support multi-album artists, it would be unreasonable to concatenate multi-album artists and save them as a new field. It would be more user-friendly to just read the first field.
If Plex ever radically rebuilt its database and implemented true multi-artist support, users would only need to refresh their metadata instead of manually re-entering all the lost album artist metadata one by one!
If, in order to adapt to the current Plex, you delete all but one of the multi-value album artists and then have to fill them back in one by one when the time comes, it would be a disaster for a large audio library. Who has the time and energy for that?
