It would be really useful to sometimes just say that a release is for example digital, or two CDs in jewel case without specifying the specific tracks on the mediums. 

For example: https://www.bigfinish.com/releases/v/doctor-who-embrace-the-darkness-2

Resulting database entry claiming somehow the *media* is unknown ("[missing media]"), when it's just the tracklist: 
https://musicbrainz.org/release-group/a2b06e0c-9393-49f7-b573-a02521170eb5