There are currently many errors in the Wikidata ontology that could be reduced if only there was more information available about the ontology when making edits to Wikidata. The property Wikidata usage instructions (P2559) can be used for this sort of information, but its value would need to be displayed more prominently. Other information, such as constraints and AutoFix instructions are also present in Wikidata but not always well-displayed when editing.

https://phabricator.wikimedia.org/T97566 and
https://phabricator.wikimedia.org/T140131
are about better display of usage instructions.