I guess they are talking about Server Objects or Shared Objects or whatever other name is assigned to objects created by end-users in the AccessPoint.
Those objects have one major issue: by default, in the AccessPoint there is no information available about fields and their content. Also, the table viewer that shows you the data model in the current document is only available in QV Desktop. The best a developer can do is to give fields a descriptive name, but that goes only so far.
That's why I think adding real Metadata to the fields that can be used to create Server Objects and expressions is a real life-saver for end-users.