Originally Posted by dutret
That is simply not true. There are some(albeit small) advantages to having a rear brake. It, unlike your feet will be able to apply smooth braking force which is very useful on surfaces with poor traction whether or not you have a front. It also provides a backup in case of mechanical failure.
Also, If you want to go on longer rides, having front/back brakes allow you to only use your energy for riding, rather than using it for braking as well.