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What if a player can't win against the AI?))) Should they still buy the game? I would consider it from this perspective. That is, a confrontation between equal opponents, and it doesn't matter whether you are playing against a human or the AI.
Well, in the early stages of the game, diplomacy can be used quite effectively, but it is unlikely that it will be interesting to use it against an AI opponent once you reach a certain level, but offline mode fixes this...;)