The main reason: so that composer discographies aren't cluttered with doujin albums.
We also use it for all classical compositions that are borrowed. Beyond that, there are some few cases where it is used. I've seen it used for some of what you describe, like if a theme from game 1 in a series is rearranged for game 6 in a series, but the original composer isn't involved. Are these the albums you mean when you say there are a bunch that need changed?
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