I disagree that the Ottomans should be taken out in favor of Turks. The game is called civilization and not "ethnicity" for a reason. The different turkic empires where not the same culturally. Especially early turkic empires had a culture around Tengriism. While later ones adopted Islam and the culture changed along. Also the influence of other neighbouring cultures were different to each Turkic empire as they were spread over a large geography. Compare the Ottomans, the Khazars, the Kharakanids, the (Volga) Bulgars, the Uygurs, the Delhi Sultanate and I can go on...
But if there is need to combine similar turkic empires then I suggest to combine Turkey, the Ottoman empire and the Anatolian Seljuks (Sultanate of Rum) and call them Anatolian Turks. I do think that another Turkic empire should be included too from Central Asia in an expansion. Besides were they not intending to distribute the civilization more properly for TSL. In all civ iterations until now Central Asia was pretty empty.
Well, I'm ok with both Ottoman and Turk. But, I have to disagree with that. Turk is not an ethnicity but nationality. I'm a Turk. Because I speak Turkish. "Turk" means "Strong" if anyone wants to join "Strongs" they can. Ethnic background doesn't change anything. You think all Turks in Anatolia are really Turks from East Asia? If you speak Turkish language, you're a Turk. I know many western europeans who living in Turkey and their kids all speaking Turkish as native language. They're all counting as Turks, no matter from where they came. Some of them Scottish, some French...
Don't know if you ever read, Ibn Fadlan's stories. When he met Khazars he said something about them " And there is people, call themselves Turks... they are like this, like that... and he adds ...They take you as their own, if you speak their language" Well, this is still same in Turkish community. Speak Turkish and you're a Turk.
Also, when Turks arrived Anatolia, their number were around 600,000 and population of Anatolia around 6,000,000 (Greeks and Hellenized Anatolians)
During the Imperial Era, over 1,500,000 Western European brought into the Empire as slaves. (the region where I'm from is famous with Northern European, -yes, Scandinavian- y-dna. all of them full blondies and redheads with grey eyes lol. and if you tell them "you're not Turk" they would come after you for insulting
)
2,500,000 Ukrainians, Polish and Russians taken as slaves by Tatars and brought into Empire
I'm not counting renegades and new timar holders (Sipahis) who brought from Hungary and Austria and other central European countries to Anatolia.
Now, mix them all. Ta-daa! Turks here!