Road bike has clipless, commuter has platforms. There's just something about the thought of putting clipless (even toeclips) on a 3 speed upright that makes me cringe. It's also nice to just ride in my dress clothes (in the cold) and shoes without having to deal with changing shoes at work.

one caveat is that my ride is a whopping 1.5 miles each way, so the benefit in power/efficiency/what have you that I would get from being clipped is minimal.