Just one set for the whole steppe from Cumans to Mongols doesn’t really make sense unless it’s entirely composed of yurts and other tents from Feudal up to Imperial. But actual imperial architecture of the steppe peoples heavily borrowed from the people they conquered, be it Ottomans mixing Byzantine and Persian influences or Mongols mixing Chinese and Tibetan. When I play as Mongols, I want to eventually build a splendid city resembling Karakorum, not just yurts over and over.
At the very least I’d like to see an eastern set for Mongols and perhaps Khitans (and Tibetans and Tanguts once they are added) and a western set for Cumans, Huns, and perhaps Turks (potentially Alans and Khazars too if they’re added)