I don't get half of those left out of your list of excellent UU and UBs.
The redcoat is not the beast it was in vanilla, but it is still quite formidable, especially with Grens being pushed back farther in the tech tree. They have one of the longest lifespans of any UU, since it takes infantry to render them obsolete. But by then, wouldn't you have Assembly Line thanks to financial?
The Stock exchange plays in perfectly with a CE, encouraging you to have high tax revenues and get more bang for your buck.
I won't disagree that with the nerf to Siege in BtS that Hwachas are quite less of a UU. I mean, at least the fast worker lasts the whole game, and you get more when you capture any other workers. But Wang has the Seowon, the dream building for anyone aiming for space, which Korea is especially adapted to.
Ragnar's UU and UB are great, but situational. Obviously, no coastal cities, and the power of both is severely reduced. Similarly, HC's Quechas are only awesome at levels above monarch, as that is when the AI starts with Archery. The Terrace is pretty good though.