Something about poppy robot

hello, everyone! I am a robot lover. and I have much experience in motor drive. In recent years, asynchronous motor and synchronous motor drive technology have development a lot, and it is more efficient and reliable because of brushless and FOC control technology. In my mind, brushless motor would replace brush motor in the future. so, about poppy robot, why not use brushless motor with FOC and servo technology, to replace dynamixel motors which is consisted of brush DC motor and expensive reducing device. Is there anybody who have same idea with me? you can contact with me by mail,