alt Hacker NewsI see it as more of a limit than a requirement. After all, you can technically satisfy your dietary needs with vegetables and eliminate fruits. But we aren't talking about technicalities and edge cases, rather what a balanced diet might consist of. For many people that does include dairy and fruits, even if neither are completely necessary.
I would gently suggest that you may be blinded by a cultural bias here, which has partly been formed by the dairy lobby over the course of every living American’s lifetime. While it is true that we are not the only culture that drinks cow’s milk, it is predominantly a Northern European and later American phenomenon, and the number of people who are intolerant to dairy on some level is very high. I’m not saying a balanced diet cannot consist of dairy, but implying it should, as the plate diagram does, is highly misleading and outright paid for.