A number of articles on this wiki have recently been deleted because they had no categories. Wiki policy specifically states that any article with no categories will be deleted. This has happened already. So if you wake up the next morning and find your article has been deleted because it violated this policy, don't cry, because you broke the policy.
Also, if you are warned once about making an article with no categories and you do it again after, you will be blocked from editing here. If you want a specific article that you made back, you can ask me and I'll restore it. Keep in mind that I'm not being mean, I'm just enforcing the rules and policies of this great wiki, which is my job (as admin). So if you have any questions, you can contact me directly, or here. Thank you.