This is because Platform 3 at Kyoto Station is one-sided, and since the flows of incoming and outgoing passengers can't be separated there is no time to turn the seats around (from the answer provided by the Kintetsu Corporation).
これは、京都駅の3番ホームが片面で、乗降区分ができず、シートを回すタイミングがないためである（近鉄への質問の回答より）。