To be honest, none of those listed above inspire me. One civilization that I very much want to be added is Armenia. This nation has added tremendously to world culture. It dominated Anatolia in the period after Alexander and has maintained its cultural integrity over many centuries. The Byzantine empire was saved at the battle of Manzikert by an armenian general. Even during the Soviet period there were many armenians in high places, most notably the soviet foreign minister Anastas Mikoyan. Today Armenia has been reborn as an independent nation. Incidentally, Armenia was the first country to officially adopt Christianity. And, just as in Poland, a deep faith has been the bedrock of the nation's identity. Please add this great civilization to Civ VI!
The other civilization I would love to see added is Mexico. By this I mean independent Mexico. Gran Colombia has been added, as has Canada. To ignore Mexico is a big mistake. It is a remarkably dynamic, diverse, and culturally vibrant nation which has attracted immigrants from all over the world. Despite an ongoing struggle with drug gang violence, Mexico has become a fully functional democratic society, and has thrown off much of the authoritarian tendencies of the past. Please add it.