There are parts of it that have aged really badly, though. I was working on an NNTP-related project last year. Article numbers and threading are a bit crappy. The conflation of messages and commands (like cancel) also sat rather uncomfortably with me.

I was impressed with it as a piece of history, but more thorough exposure left me with a much decreased interest in building a system on it. More modern approaches to pubsub feel more natural (and are also more fun to work with!)