I've been wondering for a few patches if the rise of domination strategies (on the AI side) is more to do with non-militaristic civs just not building enough defenses. It's true they just don't get as many free units, but if they also aren't prioritizing military until they're actively in a war, then they're basically just playing ultra greedy and being punished. Which on the one hand is perfectly reasonable, but on the other, would be nice if they were adaptive enough to realize "I'm surrounded by warmongers, I should probably play for a heavier defensive military style".