Something may have got lost in migration, but this is not a duplicate of https://phabricator.wikimedia.org/T54097
And we still can't see or edit the globe of a coordinates-type statement directly in Wikidata :(

There is a problem that we had not noticed before: T140792.

There might be ways to customize the number of sitelinks we accept for each site ? But actually I just realized that though adding references to statements about identifiers seems rather pointless to me, using identifier-properties as references in other statements would be useful.

Sorry if that is just late trolling but I don't see any reason why we should need references or qualifiers on url-generating identifiers, and so I do not see any reason why we should not have sitelinks. Sitelink were made precisely for those one to one relations. The only reason I see against sitelink is that sometimes, the linked website has dupes in its identifiers, but I don't think it is a really convincing argument.