Regular looter here!
Loot matrix is inundated with stealth items at the moment. About two years ago (?) there was a nerf of a lot of areas I regularly trawled, and thereafter, certain pieces of equipment became a memory (Hierophant rings, Ovate's Robes in the druid vein). On Blaustein: prior to this, I'd found two of the rings on my druid. I have never seen one drop again (coincided with the adjustment of the Shadow Caves whereupon not all skeletal loot containers would appear in an area refresh - seems other places were altered too). I'd say overall, I'd find one decent piece an RL month. Now, it's more like one decent piece per half-year. The rest of the time, it's Tamer's Goads, Jamadhars, and masterwork maces.
Again, stealth/rogue gear has taken its place: Stalker's Shortbow, Shadowed Armor, and the +2 Rogue Gloves still (occasionally) drop in the same location.
Thankfully, I have heard Dread's working on it!