Because I'm sure I can speak for nearly everybody in saying that we're all absolutely sick of having to purchase 40 shoulder boxes for the same dungeon-pair, trying to get the Heavy shoulders from one of the sets, only for 23 of the boxes to give the shoulders from the wrong dungeon, 10 of them to give the Light shoulders from the desired dungeon, and 7 of them the Medium shoulders, and still not have even 1 of the desired monster shoulder-piece in Heavy...
The same applies to spending our Tel Var stones on Imperial City item sets.
There are ever increasingly more dungeons, and more PVP sets, as they get added to the game. The original approach might have been reasonable when there were *only* the base-game dungeons, but it's ever increasingly improbable and ludicrous now.
For Undaunted monster sets: the 5-key boxes should be curated. Let the 1-key ones continue to be completely random and uncurated.
For the Imperial City Tel Var sets, and Cyrodill AP purchased sets: Curate them please!