The map stuff makes sense though because they don't necessarily need the whole plant for install. As an example Alter of Flame was a Vanilla map, but Mercury itself came later in a DLC. Same for D1 and the Trials of Osiris Lighthouse. Now if I went into the files and seen that the entire Mercury planet was still in-game, but otherwise inaccessible I'd be saying the same thing I am about Black Armory. Not really a space save if it's still there xD