Speaking to GameSpot, Epic’s Cliff Bleszinski defended the practice of including DLC on retail discs, saying that it is "an ugly truth of the gaming industry." Capcom recently came under fire for including 13 extra characters for Street Fighter X Tekken on disc as extra DLC that gamers had to buy to get access to. Gamers felt that, since they already paid for the disc at retail, they should be entitled to get the DLC content for free.
"When you’re making a game, and you’re getting into a ship cycle, there’s often three or four months where the game is basically done," Bleszinski told GameSpot. "And you have an idle team that needs to be working on things. Often for compatibility issues, day one, some of that content does need to be on-disc. It’s an ugly truth of the gaming industry."
"If we can get to fully downloadable games, then you can just buy a $30 horror game and just have it, and that stuff will thankfully go away."
While Bleszinski is probably right that games going fully downloadable will change the way DLC is handled, the day when that becomes a reality for closed console systems is many, many years away.