Unrelated topic:
After attempting to educate myself in the history of nomadic Eurasia, and being surprisingly utterly bored by it, I still don't find many reasons to add many Asian horse nomad civs to the game beyond Mongols and Scythians. I don't count Tatars, Timurids, Manchus, Uyghurs etc here as those cultures weren't entirely "nomadic", especially in their most spectacular forms
I mean, okay we could add some Turkic culture for this purpose, so we'd have "horse faction but with Turkic flavour" this time, which would be something new and important seeing how crucial Turkic nomads were for the history of basically everything. But besides that, my problem with adding plenty of Central Asian Horse Nomad Cultures is how similar and interchangeable most of them seem to be, at least until you go academically deep into them. Within Turkic segment of that whole club I utterly fail to describe differences between say Khazars, Turkmen, Kazakhs, Pechenegs, Cumans, Kyrgyz etc. The same goes for countless Iranian horse nomad groups which always just circle back to the arguments whether they were or weren't "Scythians" (that problem in itself signals how similar those cultures seem).
Special mention goes for Khazars whose main distinctive characteristic is how they maybe, seemingly, allegedly, to some relative degree, quite probably, were under the influence of Judaism, but every scientist speaking about this topic has different opinion ranging from "they were second Israel" to "the entire story is fake and lame", so I, the casual, just end up with yet another super obscure Turkic horse nomad culture with unknown language. At least they weren't like Huns who required fake city list and fake language in civ5 as we know basically nothing substantial about them besides them suddenly appearing for 50 years of plunder and then disappearing - a hallmark of a great civilization.
As usual, education from you is welcome