Boris Gudenuf
Deity
This. I completely agree. GP should play a major role in Tech research and Civic acquiring. They are the real backbone of Human Developpement. Many Inventions of Humanity can be lead back to individual Persons, which also made use of other Scholars' Works. So a rework of GP acquiring should also be considered. Maybe each District/Type would have a GPP Threshold that upom reaching it a GP can be acquired (Which will make the City lose a Specialist Citizen).
Agree that GP should have more general and specific in-game influence instead of 'generic' influence regardless of the game situation - would, for example, Thomas Edison have been as inventive if he lived in a rigid Theocracy? It can be argued either way.
On the other hand, precisely how important 'Great People' are has been hotly debated by historians for generations. The "Great Man" theory, as it was originally termed, holds that GPs Drive human progress and change. The other side is what I call the "When it's time to railroad, people will railroad", which holds that progress comes when events make it both possible and necessary, and which individual does the inventing is immaterial: Someone is going to do it when the time is right.
This being a game, we can pick which, or both, to simulate, and I think a combination would be the best bet: the exact influence a GP provides (except possibly those that provide Great Works) should vary according to whether 'it's time to railroad' - what kind of in-game situation the GP is thrust into. By the same token, it doesn't take a Great Person to build a Dam when you are getting flooded every other year, or develop better cavalry or infantry weapons if you are getting your butt kicked by more advanced opponents. Adversity and Need sharpen everybody's mind, not just a Leonardo's.