The doorway blackness issue is particularly well demonstrated in the fight against the Ogre and Hobgoblin in a barn. You open the door to the barn, see a cutscene of what is going on inside, a fight starts, and you can't do anything until you enter the door. Because the enemies inside are protected by an impenetrable fog of war. Very silly and counterintuitive. You better hope your ranged attackers didn't win inititative.
