User blog comment:Temporaryeditor78/ME3 cut content temp repository/@comment-1679409-20130129142411/@comment-4953843-20130129170827

can be for any (logical) reason actually.
 * crappy cleanup control during source compilation.
 * may result from poor communication between people working on individual sections of a game. remember that commercial releases are almost always staffed by numerous people segregated according to their specialties.
 * bonus for curious fans to give insight on the game's development process.
 * placeholder for upcoming content that may or may not be added in the future (e.g. from ashes). bummer if it turns out they abandoned a particular concept further along the software release's life cycle and the extraneous content just ends up being that.
 * sentimental dev value. people can spend a lot of effort making things that end up on the cutting floor for a wide number of reasons and those people wouldn't want their efforts go entirely to waste. overlaps with the previous points.