There's nothing wrong with exonyms in principle. However using "Florence" instead of "Florencja" in a Polish text would sound weird. If you add historical conf

There's nothing wrong with exonyms in principle. However using "Florence" instead of "Florencja" in a Polish text would sound weird. If you add historical conflict to it then it can get much worse. "Warschau" in a non-German text would make many Polish people angry because of memories of forced Germanization.