Same thing, technically, applies to wikidata

Same thing applies to OSM itself, right? For example, on the ground, you can’t distinguish between administrative entity and settlement. So there will always be a confusion. Unless you synchronize databases automatically. Wikidata makes a great job to disambiguate entities with a smallest degree of meaning.

if there is any real-world controversy about an entity

The idea behind wikidata is that there’s no controversy. There are subtle differences which are enough to establish different entities.

Check out http://geowiki.com/iD/