All right! Thanks. If I have any big thoughts or ideas I'll bring them up here. Most of the things I'd like to see changed about the mod are already in a state of discussion or development (or they're just little things like changes to the colonial era resource spawns, that I can easily change myself). I do however have one idea I'd like to discuss now, something I've seen mentioned before, but not recently:
One of the biggest things that I'd like to see added, not only to improve gameplay and historicity, is for civilisation to be added in North-central Asia around the Tarim Basin and Samarkand, a region that is currently mostly barren desert in the mod, but has been a very fertile and populous centre of trade in the era of the mod, and certainly isn't mostly desert today, despite desertification. Some of the desert should stay, but only in a few isolated tiles between the Caspian and Aral seas, and most of the Taklamakan should stay as it is already. (There's already far too much desert in Asia, each desert area such as in Iran and the Thar desert in India being much, much larger than are in reality.)
I think having a civ here would not only to be fun to play as (like an early version of the colonial civs like the Netherlands that achieve historical victory by getting resources, and maybe another goal about fending off barbarians/other empire building civs like Persia, Arabia, and China.), but also help better represent the silk route in the game.
Maybe the best civ to represent this region would be the Tocharians or Hepthalites, but that could change, like the Sumeria becomes Babylon as time progresses in the game. The central time of gameplay for a civ in this region would be the first centuries common era, coming into contact with the byzantines, persians, chinese, and indians, and declining after pressure from the spread of Islam.
Also this region was historically crucial because of the contact between the Tang and Abbasid Caliphate (both often considered "Golden Ages" of these empires) at this time. For players who want to try and experience a kind of "what if" version of history, the world could've potentially been very different if it was Chinese, rather than Arabic influence, that prevailed in Central Asia from the 8th century onward.
I know this is some rather vague and anecdotal writing on why this should all be represented in the mod, but I guess the main reasons are it would be historical, and it could make for some fun and gameplay. Sorry for the rather long-winded post, everyone, I'm not great at writing with concision.