Roleplay, its what so many people seem to want by asking for these kinda of things. If you dont think it makes sense to just run full pelt into a bandit camp then... dont. Like I said before I think more options are a good thing, but for this specific example theres nothing stopping you from just not running all the time if its say, Oblivion. Whereas Morrowind does restrict people who do want to run around all the time, which is worse than not enforcing the running rule. Less restrictions enable more variations of gameplay and theres no reason you cant place youre own restrictions and rules upon yourself.
Well... see... the problem is that there's really no point in roleplaying
This looks like a dangerous area.... should I slow up for a bit, in case I need to fight? if it makes absolutely no difference whatsoever in the game. I mean - sure - they could also eliminate combat damage and I could just "roleplay" that my character gets injured when he fights, but I would hope nobody would advocate that.
When it gets right down to it, the ONLY reason that the game exists at all is to provide things so you don't have to imagine them. If we extend this "just roleplay it" logic out far enough, then we really don't even need the game at all. So the only valid point in these debates is whether or not a particular thing
should be imagined rather than provided by the game. The fact that something
could be imagined rather than provided by the game is entirely beside the point, since, ultimately, absolutely everything
could be imagined rather than provided by the game.
I believe that at least some minimal nod to the indisputable fact that running eventually makes you tired should be included in the game. That's it. It makes sense to me. I sure as hell don't want something that's going to be drudgery (like the Morrowind system), but I'd like to see at least something - some little faint dash of reality tossed in there, just to make it that tiny bit more believeable that I'm following around a person who's living a life in a world rather than just pushing the W key and traveling across a computer generated landscape.