Thread:Aidan750/@comment-24577221-20180920052758

Generally, categories shouldn't get attached to other categories. The problem with doing it is that it can indirectly add inappropriate categories to things. For example, if the "MSM:DoF" category is added to the "Monsters" category, then anything tagged with "Monsters" also ends up tagged with "MSM:DoF". That would include monsters that aren't in DoF. 