The corollary to what .280Rem posted is that every human skill is one generation from extinction. That is why some things come up repeatedly. Eventually they won't come up at all. There must have been heated discussions on the relative merits of Damascus v. Soligen steel for hunting spears, and how that varied for target spears, but we don't hear them any more. Covering the same ground again is a sign that the community has new members, and that is a good thing.
