The whole point of keeping records is to be able to check back on them at a later time. This is why records are kept in such a way/in such an order that it would be absolutely easy to locate them when required.
Inaccurate classification defeats the whole purpose of record keeping as it makes it hard (impossible at times) to locate such record that has been mistakenly classified.
Answer: There's a big misconception that color grading black and white projects is easier than grading in full color. While in some respects, grading in color does add an additional layer of complexity, achieving a filmic B & W look can be just as complex for different reasons.
