When urban and commuting cycling, it is more likely that you'll be getting on and off your bike more often than during a road race or similar type of event and therefore, because MTB-style shoes are designed for, at least, limited walking, MTB-style clipless pedals and shoes are more suited for urban and commuting cycling. After my ~25km commuting ride during which I may only need to unclip a couple of times for lights and then, only to put my foot down, not to walk, I still need to walk 200m/yd through my building to the bike cage: I wouldn't want to do that with road shoes/cleats on the marble, linoleum and cement floors.