Maybe this is not the case in the US, but in the Netherlands we use a lot of subtitles for movies and series.
Within all the plex clients you have the option to delete those media files once you have seen it, however the subtitles are left behind.
This can leave a lot of clutter especially if you have raid-0 drives with a lot of storage. Could an option be created to also automatically delete the subtitle which has the same name as the media file you are trying to delete?