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.