This also applies to other information (info, sitelinks, aliases, labels, descriptions) but especially claims are difficult to judge without metadata which should include:
timestamp of creation (when was the claim added/edited on Wikidata)
author (who added this claim to Wikidata).
References are great but if one cannot easily check who added a claim with reference, their value is limited. Note that just having the full revision history of an item or the latest revision is no usable information because most edits only modify a part of the item. There should be a flag to wbgetentities to extract the latest edit that modified each of the claims.
Whiteboard: u=dev c=backend p=0