Makes sense; Rhye really like Japan IIRC.
Yeah, but a realistically sized Japan would've caused problems anyway.
Something that only affects the capital maybe?
They had a free Absolutism/Bureaucracy bonus for a time, this resulted in never dying super Babylonia. What about +50% wonder production? AI Babylonia doesn't really get to build many wonders, and maybe it makes wonder relying strategies more viable for the UHV.
(By the way, I'm currently also thinking about giving Pantheon a wonder production buff, so that you can actually build all those classical wonders in time).
Ok, Now im all for a more powerful China; but this technology overdose might be too much.
It isn't. I'm currently playing as China and while it's easier to be on top, you can't tech away from everyone else. For the human it's an outright necessity to research Music and the four other techs to get the UHV.
As for the AI, I've run a few 3000 BC Spain starts and China was always behind them by 3-4 techs, which is fine in my opinion.
As far the UP is concerned in 600 ad China (besides Byzantine and Arabia) is the most advanced civ which means most of the techs they research wont be discovered by discovered by other civs.
That's by design and is actually the beauty of it in my opinion, because it allows China to get a headstart but fall behind once the others have caught up.
It is more fitting that China get a population related UHV not a research based one; there were a bunch of civilizations more or as advanced as China even in Antiquity and the Middle Ages.
You should read up more on Tang and Song China. It was far ahead of the rest of the world at that time, even the Arab world, and had inventions that preceded the rest of the world by centuries (paper currency for example).
The UB is just an stronger version of the Arabian Madrassa and both are library replacements:
Examination Hall: 30% more research, 2 scientists, 2 cutlure
Madrassa: 25% research, 2 scientists and 2 preists
You really can't compare UBs like that.
I don't know if a population requiring goal is a good idea. China is one of the civs where historical behaviour doesn't manifest itself only in the goals, but only in the necessary strategy to achieve it, and a high population is a sensible strategy to meet the tech goal.