Again with my personal biases, but I don't believe any bike built for commuting should be equipped with coaster brakes. If they suddenly fail then you are left with no way to stop your bike. At least with handbrakes the probability of both brakes simultaneously failing is very low, and in the event that one of them fails you still have the other one to use. I also don't believe coaster brakes allow you to do a full emergency stop in the same way a front brake can stop you (correct me if I'm wrong), though a diligent cyclist will probably never need to do a full emergency stop.