So you're all basically saying it's fine for the AI to never move adequate forces to the border if it didn't decide on the war. Was it so in Civ IV? Of course not. And while it's factual 1UPT made Civ unchallenging v the AI, it isn't true AIs struggle with 1UPT inherently. Cases in point: chess, Go, every computer strategy ever made with 1UPT in mind originally. Moreover, among opponents on equal "military production" footing, 1UPT may be the easier AI task. Stack combat actually has extreme depth of complexity, it's basically 1UPT overlaid with many additional possibilities and risks.