Scythians and Sarmatians are Iranian peoples. Nomads from the north, but still Iranians. So since Scythia is already on game the unit would be for one of the many Persian dynasties that used them.
Sorry, modern anthropologists/archeologists may consider them 'Iranic' or 'Iranian', but their contemporaries the Persians Did Not. That's a little like saying the Greeks should get Legions because, hey, they are similar in culture and language (Indo-European, anyway) to the Romans. Doesn't fly as an argument. The whole point of the game is to find and, if anything, exaggerate the differences between Civs, not borrow from them until they are indistinguishable in game terms.
- Of course most native on NA died from disease. Something that the game lack, even being really relevant not just for America/Eurasia relation, but also for Africa/Eurasia one.
- Most of the history we know and the interaction of NA natives with RTW was after their demise by disease. So the simulation of that become irrelevant. USA and Canada interacted with the post disease natives not the pre-disease. So the result is still Americans rolling over them.
Disease is also very relevant for the European settlement of the Americas, which turned out to be almost impossible in parts of central and south America - disease wiped out large percentages of the European colonists as fast as they could arrive.
However, to argue that because the game does not include Disease all the interaction between NA Natives and Europeans in the game should be based on the surviving population after disease reduced them means I can equally argue that Mongolia is irrelevant to the game because after Gunpowder all the Mongolian and Mongolian-derived military forces were rolled over by gunpowder armies and Mongolia in the last couple of centuries has been just a dependency of either China or Russia - sort of like the First Peoples or Native Americans in North America, in fact.
I wouldn't argue that, because it is no more valid than to say that because Disease made the NA cultures weak versus the Europeans they are less relevant to the game. In fact, one of the strengths of the game is its inclusion of 'little known' or even 'marginal' (in 6000 years of World History, anyway) civilizations. If anything, we need more of them included. After all, IMHO the point of the game is to make the civilization you are playing Important regardless of its real world significance. I take a great deal of pleasure playing as the Cree and winding up with subordinate cities named Ottawa and Washington.
- Still, Central and South America had more advanced civilizations, proper cities, recorded history, armies and interaction with RTW when diseases were expanding.
- You can see on Mann maps that SA agriculture regions is way bigger than east USA. So where are the Tupi, Carib, Ge or Arawak civ? Why not Chichimecs who caused so many problems to Spaniards and Mesoamericans?
- Guarani is the official language on Paraguay, even people that dont look native have it as their first language. The proper Guarani had interaction with Inca, Spaniards and Portuguese. Why not them?
Why not indeed? I would never argue against the inclusion of any civ or culture as long as there is enough information to produce a Civ from them for the game. In many cases, there is more than enough information to do so if someone is willing to do the research. In others, there simply isn't (at this time: more information keeps being discovered about even 'ancient' civilizations all the time). This includes 'European' Civs like one of my favorite 'early European' civilizations, the Minoan Cretans. There just isn't the information we need, like a list of rulers ('Minos' probably wasn't the name of a ruler, from context, it appears now to have been a Title, so we don't have even one Leader for the Civ).
Unfortunately, several fascinating American Native Civs are in the 'Minoan position: Not Enough Information of the kind the game requires for a valid in-game Civ.
The other arguments for or against a Civ's inclusion we've seen on these Forums and in this Thread: Geographical, Ethnic, Temporal diversity, ability to make a Civ Different Enough that it doesn't just repeat the same play style as another Civ already included, and, far from least, Marketing and Sensibilities. Marketing means there will be disproportionately, Civs from areas that now include large numbers of Gamers With Money to spend on the game: that means, inevitably, Europe and other 'First World' areas will be disproportionately represented in the game. Sensibility means that Civs offensive to groups or governments will not be included: Tibet because of China, Nazi Germany because of Everybody.
As for your list of potential Inclusions: Tupi, Carib, Ge, Arawak, Chichimecs, that list can be matched by a European list including Irish, Bohemian, Finnish, Bulgarian, and Swiss. And equal lists from almost anywhere else in Asia or Africa. The argument then, is what makes them worth including in a game which does not and never will have room for every possible Civ? What makes them different, diverse, Unique enough to be chosen over others and would make them Sellable enough for the game to succeed economically?