I agree tha it is more useful to know/track/care about hours than time for training purposes, but not everyone has the same reasons for riding and the same goals. To label someone a "true rider" or not because they don't meet your criteria is a bit silly.

Note that some of you may think that this position is hypocritical for me given my posts in threads like "average distance", but my problem with that thread was only the issues surrounding taking the "average" of a bunch of different length rides and having it be representive of the riding one does.