Mgolden, let me explain. With 9 frames in the brood chamber they draw it out more than ten but only to a certain extant as the brood cannot be reared in a cell that is too long. Therefore their is more space within the brood chamber. This reduces congestion and adds ventilation. Within the honey supers, you are correct, they draw out the cells as close as they would be in ten which makes them easier to uncap. Also, longer cells make longer bees. Why do you think queen breeders pick out the biggest queen cells. I dont make this stuff up.