There's no butchering, you're just wrong. Humans have categorized stuff this way a lot longer than either of us have been alive, and though it's messier in colloquial speech, it's still the case even in formal scientific categorization and in all languages.
Feel free to clench your firsts, stomp your feet, and wail if you want, but it won'tt change a thing. And as I pointed out, the problem here seems to be that you're ignorant about the Japanese origin of the slang "futanari." Your personal definition is not the universal one everyone else must use.
Dickgirls have always been included in the original Japanese description of futanari because, once again, it's their fetish catch-all for something that is neither purely male or female in appearance.
This site's tagging system is another problem entirely. They could probably do with more specific tagging as well as tag definitions like e-hentai has so there is no confusion. For instance, getting rid of futanari and just doing herm/intersex and dickgirl/trans.