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Because they are further down the tech tree and you can use them for attack and defence also you don't have spend resources on it and can build bireme with Trieme for a stronger fleet

I think instead of the ship building speed power that Posideon has(call of Ocean) you could get a Trieme instead, because if you want to focus on developing temple you have to stop the progress to research in academy to get a ship. So in a way your spending resources on a building when you could...