Maybe because NM KP is a joke.
I found that doing Nightmare KP was time consuming than doing SM EC pre-nerf (p-n). NiM KP took me 90 minutes whereas SM EC p-n took me 75 minutes on a bad day. I understand taking the BH comms out of SM EC, especially since I've seen 40 minute runs of the SM EC p-n (40 minutes
) but they should have left them in NiM KP, 'cause now no one does NiM KP anymore.