I think you are all right, gentlemen, each in your own way to some degree. As I mentioned before, when the game stays totally (or at very least mostly) in line with real History, it is kinda cool, ya know!! At the same time if it breaks game balance or AI or it gets too heavy on hard drive it is not good either!! So, I don't know, how can we keep these two goodies - Entertainment and History as close as possible to fun making through learning.
I still think, Toecutter, that we should all start the game as "cave people" and "barbarians", it is the first stage of the human society that we always tend to forget or omit, but, oddly enough, we do resort to barbarism at the worst of our time and regret about that later. What is it now? Is it sado-masochism or what? OK. It is conscience struck materialism.
And then we continue to play at first stage called Prehistoric Age without cities or with some few cities, rather villages, with may be stupid names like "Rotten Cave", "Hairy Arse", "Mammoth Hole" and etc. and then after we are done and through with the Prehistoric Age (of course, certain things would lead to this breakthrough and something on top of that triggers the transfer from one Age to Another, let it be, knowledge, advancement, a stockpile of resources, science, religion, or culture, or all together, now I understand these would be primitive in Mammoth Hole, but still.....) and then a popup menu will show up prompting you, that you are now entering new Age, your tribe has become truely versatile and complicated to such a degree that they start dividing between themselves in languages, and popup menu would ask you to choose Indo-European Tribe, or Afro-Asian, or Ural-Altaic, or Sino-Tibetan and etc. And you live with that tribe further through Stone Age to Copper Age, collecting and building you empire, tribes, collecting knowledge and wealth, may be, fighting all the way through, may be, using diplomacy, very primitive one, of course, until something triggers the Advent of Copper Age, whereupon another popup menu springs up and prompts you that time and people have become so sophisticated that they divided into further nations and tribes (if you chose Indo-Euro, you would be divided next into, Romanic, Germanic, Slavonic, Iranian, Indian and etc.). Same thing happens if you chose Ural-Altaic it would ask you to choose further among Uralic, Finno-Igric, Altaic, Turkic, Japanese, Korean. I must be wrong here, scientists or some of you can correct me. I am still obsessed with this idea. Did I mention this before???
And it goes on, and on, until the Iron Age when mostly all nations took the shape more or less of the modern nations.
Cities would be primitive at the first stage, building only one unit at the same time, but next, into Iron Age or Medieval Age, may be cities should be able to build several things simultaneously.
You can add more pecularities. Government types should vary more with Military Juntas like in Latin America, and Theocracies like in Saudi Arabia.
The option of civilization leaders should vary as well, there are 10 or 20 famous leaders that used to be in each nations, why not include them? How's that sound to choose French and choose French as your enemy, and have Joan of Arc fight herself??