7PK uses a limited set of categories. CWE-699 uses a rich, overlapping set of categories, although this poses maintenance challenges. For the most part, CWE-1000 has been able to rid itself of categories, although some might argue that the Pillars are so abstract, that they might as well be categories.
Conclusion
The three views discussed in this paper have different strengths and weaknesses, depending on the audience. Given CWE's support for diverse audiences, these different views each serve a different purpose.
A Comparison of the CWE Development and Research Views