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.
Yes, I did that fight yesterday it was really awkward.
Clearly current implimentation is lacking, but it's moving in the right direction. Create a system so we can "peak" into the room (of course the challenge will be so it won't be bugging out, or rather working as intended and giving us vision of a room through smallest cracks) so if the doors are wide open, and we are standing in front of it we can see what's inside.
Currect implementation is just simplest to do - it's a trigger. You enter the room you get to see what's in it. But it can and should get better.