Evolution gives a good account of this imperfection. Brain size increased over time in our ancestors, and the remodeling of the skull to fit the larger brain entailed a reduction of the jaw. Evolution responds to the organisms needs through natural selection, not by optimal design, but by tinkering as it were, by slowly modifying existing structures. Consider now the birth canal of women, much too narrow for easy passage of the infant's head, so that thousands upon thousands of babies die during delivery. Surely we don't want to blame God for this defective design or for the children's deaths.
Science makes it understandable, a consequence of the evolutionary enlargement of our brain.
Females of other animals do not experience this difficulty. Evolution makes sense of the anomaly. Our remote ancestors forelimbs were legs. After our ancestors became bipedal and started using their forelimbs for functions other than walking, these became gradually modified, but retaining their original composition and arrangement. An engineer who would design cars and airplanes, or wings and wheels, using the same materials arranged in a similar pattern, would surely be fired.