The issue (with US Open caliper golf) of simply letting the rough grow in narrower past 300 yards is that the longer the drive, the shorter the iron required. And, the stronger the contestant, the higher loft of the iron required to get home. This, therefore, does not work out well, even though it sounds quite "easy" to accomplish.
I am reminded of William Flynn's remarkable quote — and the order he so perfectly described the ideal hallmarks of the demand of a golf course:
"Accuracy, carry and length..."