a content-derived uri is a necessity for some things (indisputable facts, scientific papers, opinions at a moment in time, etc.) but foolish for others. Think o

a content-derived uri is a necessity for some things (indisputable facts, scientific papers, opinions at a moment in time, etc.) but foolish for others. Think of a website displaying the current time or anything inherently mutable. But having unchanged documents move to new locations on the same domain without a redirect but a 404 is just utter unforgivable failure. Or silently deleted documents, also an uncool nuisance. Both happen a lot. That's what comes to my mind, when I read the initial quote.