No, I thought you were saying that a game was incomplete just because they added an expansion pack to it at any point, ever, which is a definition I find to be pretty absurd but plenty of people use. In this case it sounds like you're saying that some games are incomplete just because you prefer a modded, remixed version of the game rather than the one they actually made, which is a definition I'd also disagree with. Large swaths of empty space, particularly in Elder Scrolls and Fallout, is an aesthetic and design choice, among other things, and more or less reactivity may or may not mean that there isn't as much depth in the story, but those games have other strengths, like build variety, exploration, and such.