I think they may have bugged something. I noticed in The Eastern Wastes a lot less mobs up in the area I was killing (one of those where named could spawn from multiple locations in the area). I thought maybe somebody had just come by, but no, there are definitely less mobs there now. After killing the mobs that were left for about 5 hours there were 0 named. I think the ones that are gone may have been the PHs then, while the ones that remain are just normal spawns without a chance at a named. If I was just getting a ton of PHs I'd say well, they nerfed it a bit too hard, but the fact that half the mobs in the area seem to have vanished completely seems like it has to be a bug to me.