I want events to occur while I'm down in the dungeon. Maybe a neighboring village got attacked and now it's in ashes and down trodden. Maybe a castle is being besieged. I want a "play your own adventure" where the story just kind of happens. No main plot other than maybe certain events happening at a specific time. Games today are too linear. Even "open world" games. They zone it out so there's a progression, go to t…
One problem with the simulation route is that games in the D&D lineage are usually wildly unbalanced. A, say, level 5 monster could run through endless level 1 NPCs. Also, much of the machinery of our world (e.g. commerce) doesn't really work when then there are incredibly dangerous and malevolent critters scattered throughout.
In a different combat model, an equally unbalanced monster would avoid unnecessary fights agains groups of armed opponents. Not because it's afraid it would lose, but due to the risk of permanent injuries. Determined defenders could then try to take advantage of that behavior to drive the monster away.