Hmm, I guess the AI also doesn't set the production to science 5 or so turns before the birth/buying of a Great scientist in the modern/atomic/information Era? That might be an exploit as well like using the culture process before getting a great writer.
I'd be in favor of a significant nerf to the World fair.
Progress culture right now is in a weak place but overall Progress is still fine.
Progress needs to focus on culture and science more than tradition does but tradition has production problems outside the capital.
Progress is probably my favorite tree on the current patch. Part of it is based on warring with the AI. There are certain windows. It's easy to keep up for a little bit. Then the AI takes off around medieval and it gets precarious. That's rough for authority, so I prefer Progress a lot of the time. Its tempting to go very wide but it can be hard for culture, et cetera to keep up.