I create project categories from different perspectives, i.e.
1. a framework development and customer projects using its libraries.
2. development projects vs. QA projects vs. customer service projects.
3. a framework development and an QA project for this.
My JIRA project fits in multiple categories, i.e. it is a framework AND it is a development project.
Depeding on my role, I'm occupied with all service projects or with a project's development and QA, and so on.
Allow to associate a project with more than only one category. Then I can configure my dashboard by selecting the category best fitting my point of view.