Epic and Legendary loot drops should be increased on higher difficulty missions. My buds and I are constantly getting common, uncommon & rare gear when doing the harder missions. Legendary drop rates seem bugged for sure. Another issue I'm seeing now is you can't unequip potions anymore. An idea to fix the drop rate for potions would be nice too. Have the game drop the potions you need/missing stock of instead of just a random one from chests.