It's not just that they may cost more, but constraints on the alternatives may render them unsuitable.Maybe your fruit will rot, maybe your hotspot use consume your data allocation, maybe your generator only produces enough power to keep the refrigerator/freezer running and the house heat on, or maybe the ambulance can't get you to the hospital in time.

There's a saying in real-time systems out a late answer is the same as a wrong answer. In this situation, a solution that does not satisfy all the constraints is the same as no solution.