Rim brake pads wear out and have to be changed. When I used rim brakes, a set was good for a month during the winter. Snow got in and inhibited braking. Once the rims wear out, it's $500 to build my dynohub into a new wheel. Fail. Drums, in contrast, go a year or more (3,000 miles) between service intervals. For me, the bike has to meet or exceed my car in convenience, dispatch reliability, and service intervals or no point in riding.