>>38431270>That's not true at all. If it's actual DLC then the game does in fact need to be updated.
No, it doesn't. At least, not in the way you're suggesting. You mentioned aspects of a game being modular earlier. The truth is that nearly all game code is inherently modular. Game code is nothing but a series of routines telling the game where to grab the next bit of code from. In nearly all modern games, and most PC games, that also involves sending the game through different files to grab different bits of the code. Nearly any piece of code can be stored in a separate folder and, as long as the game knows where to look, it can simply be told to see if there's something in there and use it instead of the normal file if it works. That's how patches and DLC for disc-based games work, since it can't update the disc itself.
Nearly all modern DLC works in the same way, unless it's something extreme enough to update the core files (which is mainly reserved for games that didn't take DLC into account when programming the base game or games that require a core file for some reason). Things like the DLC musicals, tournaments, and C-gear skins in BW work the same way. When you download them, you are "updating" the game, as you put it. They're saved into a blank section on the cart and bits of the code can see that it's in there and are re-routed to account for it. Much like when a disc-based game is updated, the core files aren't changed.