i have to wonder why they don't just cut the NM's completely out of the content?

okay i have an idea:

you get quests for your party. party leader accepts them and these quests are nothing else than "grind mob x till a boss of mob x spawns" - and this boss is for your party alone, just like treasure maps or leves, no open world zergfest. when you kill the boss the quest is completed, you get exp, crystals and lockboxes and you can accept a new quest where you have to grind a different mob.