I don’t think DLC is ever made to “fix” the base game unless the base game’s problem is not enough of the same content, but this DLC only adds a ton of content like legendaries you can shiny hunt, tons of rematches, double battles, 50% more Pokemon, new megas, and many new side quests which is honestly the best they’ve ever been. A new map would’ve been even smaller and disappointing, and there’s nowhere in kalos that could serve as a DLC map, but I wouldn’t have minded if they let us go to a hyperspace black city/white forest if it would’ve been the same size.