I'm going to interrupt this discussion to talk about my current game, which is about into the industrial era, as China. I noticed a couple of odd things.
Chu-Ko-Nu's obsolete at Industrialization, but upgrade at Metallurgy. I'm guessing the point of this is to allow you to build the unique unit even after you've unlocked it's replacement, which is totally fine. The problem is, I managed to get Industrialization before Metallurgy... Now I can't build Chu-Ko-Nu's or Volley Guns, or any ranged unit at all. Seems a little odd for a unit to become obsolete even when there isn't any replacement for it yet.
Since I like the idea of keeping the UU for longer, the best solution I can think of is the move the "obsolete" tech to something that requires the "upgrade" tech. This does the job but prevents my stupid mistake. I'd imagine this should apply to other UUs as well but I don't know how those are teched.
In this same game, I went to war with Spain and took most of her cities. What was interesting about the war is that she wouldn't let me stop. After I took one or two cities I was ready to quit, but she wouldn't negotiate peace for many many turns, all while sending one or two units to be evicerated at the hands of my composites and dromons. At some point I decided to just take advantage of it and get some more land. I noticed that once I started sending my armies to the city, she became willing to negotiate, but after I took it, she refused.
Eventually, I moved my army towards the cities she had left and she did negotiate, even becoming my vassal. Now that I think about it, I guess it makes sense that they'd try to take advantage of you having your army tied up elsewhere, but after proving I'm capable of wiping her out, you'd think she'd be more open to a peace deal.
I also noticed that the AI have very long, drawn out wars as well. Sweden and Spain had a war early on that I joined in, and eventually they made peace. But the Aztecs went to war with Mongolia, The Shoshone, and the Maya, and two of those wars only ended because Mongolia and the Shoshone were wiped out! Maybe Monty doesn't like peace deals, or he just wanted land, but I'd imagine the Shoshone should have wanted peace at any cost, and considering Monty's UA, he should have wanted it too. But this is all more of an observation than a suggestion. I don't really know if any of that is intended or perhaps just chance.
Something more likely to be a bug: With Spain as my vassal, my religion refuses to spread to her cities. She did found a religion in a city I have since taken and inquisited. She has two cities now surrounded on all sides by my religion, but neither of them are receiving any pressure from anywhere. I'm able to spread religion with missionaries, but even weirder, the missionary must be inside the city, not just adjacent to it, to spread religion. Looking at the cities, there are a few followers in each, but nothing indicates any pressure from any religion. It's possible they are actually being pressured, but I doubt it as they're the only ones in the middle of a continent of Buddhism not to get it.
Finally, I'd like to say that, as this is the first CBP game I've played in a while, I'm really enjoying the combat mechanics. I play on epic speed so the units have plenty of use, but the thing I find most interesting is how much danger units can be in. I've lost several archers thinking spearmen can't possibly be
that strong. That's when I noticed an archer's combat strength is way lower than their ranged strength. Lost my upgraded scout that way too.
All in all I'm very impressed with how this is coming. Even having a glance at some of the UA's that were being debated, all of them seem very interesting with unique mechanics. With China's UA I was able to exceed Monty's population despite having about a third of the land. And happiness is much more manageable now, though of course I've been focusing on it to benefit my UA.
Thanks for reading, if you did. If I notice anything else I'll be sure to point it out, as always.