Current East Asian set is definitely based on Japanese architecture I can see many similarities. The Japanese civ can keep this set while a new generic East Asian set needs to be created.
While Japanese architecture indeed took some influences from Tang era Chinese architecture, it also has its own particularities and cannot be deemed as a mere copy of the Tang.
Yeah, despite being 16th century I think the Erdene Zuu Monastery is a good exemple of why the Mongol architecture definitely can’t be summarized as just yurts.
Do you even know what Karakorum is and where it’s located? If not then you’d better do some basic searches on the Internet before writing your comment, or else it’ll make you look like a joke.
In addition to having the sets split into subsets, I’d suggest that each civ could have a unique castle skin and a unique monastery skin, which can be more aesthetically pleasing, and allow older civs to align with newer ones, and also avoid issues with civs sharing the same set actually belonging to different religions. Personally, this also avoids a situation I don’t want to see, which is to keep the default East Asian castle for the Japanese. The default East Asian castle actually has some elements of Chinese gatehouse not commonly found in japanese castles.
Additionally, the Yuan were very influenced by the Tibetans and Tibetan Buddhism, with senior Tibetans holding high office. There wasn’t the tension from universalistic religious like Islam and Christianity neither was there the Daoist/Confucian tensions from their subject Chinese population.
It’s not a high priority for me, but some variety in Dark Age architecture would be nice. You could have yurts for the steppe civilizations, Bedouin tents for the Middle Easterners and Berbers, mud huts for the sub-Saharan Africans, and wooden huts with thatched roofs for the Southeast Asian and Mesoamerican civilizations. Iron Age roundhouses would also suit the Celts very well.