Just off the top of my head things that came about because of the military necessity, Malaria and Yellow Fever Vaccines, Anesthesia and Anti-Biotics.I find that an interesting idea, especially given my thoughts on the military side of the Civ franchise. I’ve always sort of looked at the warfare side of it as a bit metaphorical. All the other aspects of a Civ game (the modeling of governance, scientific development, economic development, religion, etc.) have always been the parts of the game that have held my deepest interest-even though I have also always appreciated the need for a robust representation of military struggle.
It might sound counter-intuitive to many, but I feel that this reflects how real life works. Despite the fact that there have always been wars-big ones, small ones, devastating ones, etc-I don’t think human society and achievements revolve around warfare. It might look like that, but I actually think Warfare is a reeeeaally big and prevalent side-show to the main event: all the other peaceful pursuits that I mentioned. I look at it this way: we don’t work and live in order to war, we war in order to work and live. In order to work and live in a certain way-the way we want to work and live.
Having said all that, I will also say I can hear the screams of protest from so many, in my ears right now, were the military layer of Civilization abstracted down to such a level.
Even I think that the answer lies somewhere between the way things are now and the way things would be with your proposal.
But I like your general idea though.
The Worlds militaries have been at the forefront of tech discovery or innovation since Humans first left their Caves. To say that War has not influenced the growth of Civilization is to show a outstanding lack of understanding history. Every great civilization/ empire in history got there on the shoulders of their military.
Without the Military aspect of Civ you might as well be playing Sim City, but at least they would have little trouble programing this games AI to hand you your Fourth point of contact on Settler difficulty.