SharePoint Audit Report does not include workflow events

Recently a colleague of mine wanted to generate the audit report for workflow in a SharePoint site collection. However, an error page was shown instead, stating Report contains no data. A quick check on the web shows that this is a known issue, and SharePoint does not provide workflow auditing report in this context. So why give this option in the first place?

KB article: http://support.microsoft.com/kb/953133