Those bikes are not meant to go places with big hills. DC has no natural hills in the central area, but on the outer parts it is surrounded by hills.
The one bike fits all idea is never going to work. Even the famed flying pigeon is no good on hills. You buy a bike for a specific use in mind. Do you see mine dump trucks with their thousands of horsepowers at the drag strip? No. Do you see honda civic being used to haul a 53 foot trailer? No. Ultimate urban bike, for what city? And yea, that rear fender thing is a total joke.