What do people think is the very useful tech that the A.I. is most slow to research? My thought is replaceable parts. The worker rate bonus is great when you're trying to complete your rail network and infantry are awesome. They're cheap to build and upgrade to, and almost unbeatable defensively until people get tanks, and even somewhat useful on offense against riflemen & below.
The A.I. is also very slow to research medicine to get to sanitation--that's the tech that enables you to take full advantage of railroads by population explosion. Actually, the whole Industrial age approach of the A.I.--going after Nationalism and then fascism and communism seems totally wrongheaded. Then again, they usually spend the whole industrial age at war, so maybe it makes sense...?
The A.I. is also very slow to research medicine to get to sanitation--that's the tech that enables you to take full advantage of railroads by population explosion. Actually, the whole Industrial age approach of the A.I.--going after Nationalism and then fascism and communism seems totally wrongheaded. Then again, they usually spend the whole industrial age at war, so maybe it makes sense...?