The way I understand it, this system does not take the bins all the way to the curb where they get picked up. It just takes the bins close to the curb, you still have to move them off the moving platforms manually, and on again after they have been emptied.

Usually, the different recycling bins do not get emptied on the same day, so it would not make sense to put all of them out for pickup. The purpose of this system (I think) is just to make it easier to get the bins from beside the house (where they're usually stored) to the front of the house (from where they can be put out on the curb more easily).