For a city bike, you could get a chain drive fixie which barely wears at all and only requires some oil every few months, can be repaired easily and is very cheap. Belts last about as long or less as a fixie chain drive with regular oiling.

Belt with two internal gears lasts much longer than a mountain bike 18 speed chain drive, but then you're comparing apples and oranges.

This is a bike designed for the Apple user, basically, except that it seems inexpensive, which is nice. If you never want to think about how a bike works, this seems fine. But my original point was to learn how to maintain a bike.