Three reasons CK should utilize Data Categories when creating articles in Knowledge are:

Data Categories help organize the Knowledge base content displayed. Data categories are logical groupings of articles that reflect your business needs and processes. You can create a data category group and assign it to one or more article types, and then create data categories and subcategories within that group. Data categories help you organize your articles by topic or criteria and make them easier to find and browse by your users or customers.

Data Categories provide a way to secure access to the Knowledge base content. Data category visibility is a setting that determines which data categories users can access based on their profiles or permission sets. You can use data category visibility to control access to your articles based on their data categories and ensure that only relevant and appropriate content is displayed to different users or customers.

A Knowledge article can be tagged to more than one Data Category. A Knowledge article is a document that provides information or answers to common questions or issues. A Knowledge article can be tagged to one or more data categories within each data category group that is assigned to its article type. This allows you to classify your articles by multiple criteria and make them searchable and accessible by different users or customers.