Hmm... does that fable mirror an actual use case? I suspect there are a good number of programmers using XML without RDF who would say their productivity is not suffering. Whether they would say the same after doing it the "RDF Way" is an interesting question. Anyone in xml-devland have a use case to match the fable?
The best use case I can think of is the one that prompted the article in the first case: RSS 2.0 modules vs RSS 1.0 modules.