I personally believe the Kunark npcs losing aggro was due to pathing. It seemed some npcs were harder to keep on you than others.. like kunark giants iirc. I do not believe this phenomenon took place in classic, and I also don't remember it in Velious.
Obviously evidence of some type would be good. All we have now is anecdotal evidence.
One example that comes to mind is Trakanon the dragon. If you were to aggro him in his lair, and get banished (Trakanon's Touch) .. he would summon you back. With a base lose aggro by distance, this wouldn't happen would it?
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