Well the main reason is because I used to be able to do it, and now I can't, and I don't feel like the reasoning is sufficient, since custom categories with the same name as global categories are still differentiated in the Manage section. I would prefer to be allowed to use those duplicates.
I'd prefer not to have to do something ugly like add a character to a name instead of using the actual name that I want to use, which I have previously been using. I'll be hiding the originals and only using my copies, so I there is no confusion in usage.
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