The reason why each country has its own unique medieval fantasy elemental is to bring diversity to the worldbuilding and storytelling process. By assigning different elements to each country, it allows for the creation of distinct cultures, mythologies, and magic systems within each nation. Repeating the elements across countries would diminish the richness and uniqueness of each culture. It would create a sense of homogeneity and leave no room for exploration and creativity. Additionally, having different elements for each country enhances the sense of discovery and wonder when people from different nations interact and showcase their distinct elemental abilities. Furthermore, assigning different elements to each country reflects the diverse and multicultural nature of our real world. It allows readers or audience members to connect with characters and settings that represent their own cultural heritage or have a sense of familiarity with them. Overall, by having unique elemental representations for each country, the storytelling becomes more nuanced, engaging, and representative of the diverse cultures and mythologies that exist in our world.