As per the relevant forum discussion (https://community.metabrainz.org/t/rethinking-the-dialogue-guideline/548229) it seems most people who care at all would rather see [dialogue] only being used as a last resort option, rather than every time the dialoguing artists are not mentioned as track artists. As such, we should change the guideline at https://wiki.musicbrainz.org/Style/Unknown_and_untitled/Special_purpose_artist to specify that this should be used only if there's no info about who is talking that could be used instead.