... except the one-city-challenge style is ridiculous and weak (large swathes of the world uncolonized by the 1900's, really?), and the highly expansionistic AIs like Catherine are consequently generally more successful than the rest of the silly AIs whose scripts mean they'll sit in their three pitiful cities waiting to die a slow and excruciating death. Expansion wasn't killed off by BNW at all; the entire community is overreacting to the "Oh my GOSH! 5% science penalty!!!" that only really serves as a slight limiter to expansion rather than an actual barrier, much the same as the culture penalty.
- but yeah, the AI could still use a hand with some of its city placement spots, though BNW and updates have certainly improved things.