Why 'Unfeatured Documents'?

Its a phrase I coined at my first 'proper job', post PhD. As is pretty common, that company's products had a lot of undocumented features. What I've subsequently found to be less common is the vast numbers of what could only be called unfeatured documents, entries in the manuals and help files describing functions that, when the actual code is consulted, turn out to be stubbed out at best and totally fictional at worst!