If you're anything like me, you shoot for precision. Some people may be okay missing center mass of their target a few inches. But at 300 yards, your bipod zero WILL absolutely be off if you shot from a bench. Precision shooting means knowing every last thing that will effect your shot and controlling it.
A realistic situation: you're on a hunt. You spot a beautiful animal and you're going to kill it. You make you quick dial adjustments or mentally note your holdovers and all that other fancy shit, you check your distance to the grazing animal; 325 yards between you and the animal. You put your cross hairs on it and check your cosine indicator, it says .88. So you multiply your distance by .88 and it comes to 286 yards. That fourty yard difference can mean the difference between makes a kill or scaring the shit out of it. The cases are far more extreme here in colorado, you may be shooting from a top of a steep hill into a valley.