Currently statements with all possible ranks are displayed identically in the Wikidata web UI, which makes it difficult to distinguish deprecated (i.e. somewhat wrong) statements from correct ones. Statements with deprecated rank should be displayed clearly differently from non-deprecated statements (e.g. different background color, fat warning sign, etc.), in order to make sure that also casual Wikidata users understand the matter.
There was T115112 (closed) and there is T87327 (stale) related to this task.