-I suppose that un-killable NPCs is a given (but necessary for the plot to proceed(maybe could be fixed by turning an option on/off?)).
-No quest to rid Riften of the Thieves Guild.
-Killing all of the Dark Brotherhood in one quest (They would easily win this fight. (Fixed by having to track them down?)).
-No magic or shouts while on horseback (I know this is a fighting point, but had to bring it up).
-Just thought of this. What if you were a die-hard Nord who disapproved of the Mages Guild? (There is no quest to rid Skyrim of the Mages College).
-Cannot join Silver-Hand to defeat werewolves.
-Cannot join Vigilants of Stendarr.
-Can do quests for Mara and Kyne, but none of the other Aedra.
-No Jyggalag quests (I guess this is understandable as he is roaming the planes of Oblivion...but still...)
-There are very few people who oppose the Daedra (The Vigilants do, but other than that everyone else really doesn't talk about them (Thought: except Mehrunes Dagon, but only because of the infamy caused by the Oblivion Crisis)).


So...this is just what kinda pulls me back into reality. Any thing else?

Nowadays anything can be called immersive or non-immersive...