Invisible walls will stop me, I don't want small nodes that only encompass a small area that doesn't have the room to have anything worth seeing in it. F1 and F2 system had the same thing over and over and over again till you got to main area, so your saying that had substance?
I don't think anyone's is asking for areas that have nothing "extra" worth seeing. I also have no idea what you refer to as "main area" in Fallout 1 and 2. The nodes there did what they were designed to do, quests and NPC interaction. There weren't extra empty spaces in them, because that was not the goal of them.
I responded to your point because it seems odd to me that if there was to be nodes, the game, according to you, would need to be multiple times bigger than without them.