the best way to increase the understandability of the CRUFT rating for documentation would be to create a linear calculation for it
There are two versions of the calculations. The first formula is logarithmic which means a resulting score tends to increase significantly with small changes in the values of the formula components. The second one is made more user-friendly and forms a linear curve that distributes the results harmoniously.
I assessed a couple of tickets I created (90%, 50%; 80%; 90%; 90%) by these formulas. One showed 71% of cruftiness, while the other indicated 20%. I guess you could easily understand what formula I favor more. But jokes aside, I indeed think that the second formula is just more handy in understanding how quickly you’d better improve your docs.
Despite the fact that I do not think that this score should be mandatory, there is still a sense of its existence. Once measuring BA’s impact on the product is a separate topic for discussion, evaluating the artifacts prepared by BA can be a useful activity bringing us some valuable insights about how BA distributes their efforts between different activities, including documentation.