I don't think this is very interesting.
A good AI is designed to win the game, not just to emulate player behaviour. Because RTS/4x AIs are difficult to design in a way that wins the game using finesse, the best way to go about it in rts or 4x is (where applicable) design for indefinite snowballing of economy and attack strength.
FreeCiv AI is incapable of leveraging lead to wipe out opponents, result is dull stalemate.