Say S-E fixed all that, added cloth physics, made you stumble and shit or fall through the tent if you're standing on it. Then what? Should that hole in the roof stay there forever, should we see NPCs working on it? Because it magically fixing itself is unrealistic. Now a bigger problem arise, you're gonna whine that your PC can't run the game.
Or they can set invisible walls next to tents but then you can't really complain that jumping on tents is not realistic since now an invisible force is keeping you from jumping on it. I don't know about you, but I'll take jumping on the tent over invisible walls or unable to run the game at good FPS.

I would love if the hair in ARR was like this http://www.youtube.com/watch?v=pOlQ_YeR6Gc but it's time for US, the players to be realistic. Some things are just not possible if you want to reach out to as many people as possible.