3D games also have massive load times, entering a house in BG2, TOEE or Fallout = Instant. Enter a house in Witcher, NWN2, Obliv etc and your twiddling your thumbs for ages, then you find there's nothing in there you want and wait another age. They may have (arguably) caught up with teh pretty, but their still miles behind in terms of efficiency. If they were to make TW have instant interiors it wouldn't look half as pretty.
2D backgrounds are as destructible as you code them to be, there's no reason you can't have overlays to change the state of locations. Unless you mean red faction style tunnelling, but you wouldn't want that unless it's a FPS/3rd person game.
while pre-rendered backgrounds are not destructible.
2D backgrounds are as destructible as you code them to be, there's no reason you can't have overlays to change the state of locations. Unless you mean red faction style tunnelling, but you wouldn't want that unless it's a FPS/3rd person game.