Wikidata supports Musicbrainz Recording ID but not the other way around. Any particular reason or is this just an oversight?
Just guessing here, but I believe it’s because the Wikidata object represents the song itself and not any particular recording of it, and that maps better to a MusicBrainz “Work” instead of a “Recording”.
As far as I know that is neither an established practice nor a rule from Wikidata’s perspective all though it might initially have looked that way to due to 1-1 mapping of Wikipedia articles about songs.
I have nothing against allowing Wikidata for recordings when the Wikidata page is about a specific recording. I haven’t seen many examples of that though, most map to the Wikipedia things and are mostly about works. Are there a fair amount of recording items?
I see one problem with this: When you add a Wikidata link the system doesn’t check the “instance of” setting of the WD item so you can currently link a WD item of an artist to a work or release group.
I think artists, works and release groups are different enough that not a lot of mistakes happen, but if we enabled WD links for recordings I believe tons of links would end up there that don’t actually belong.
MBS should really do that, though!
Good spot, I have updated a ticket where it could be usefully checked: https://tickets.metabrainz.org/browse/MBS-8333?focusedCommentId=46340&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-46340
Not a massive amount, but the number is growing as WD editors are encouraged to separate works, releases and recordings.