I'm writing this article - How to hold a guitar, based on my personal experience and believe me every guitarist will have his or her own style of holding and playing the guitar and the comfort zone comes after several years of practice that shows the amount of control you have on the instrument, basically its like driving a car or bike, At first when you're learning as a beginner, you become conscious this is natural instinct and there is no eyebrow raising situation here. For driving a car or bike you always make sure that you are sitting in better and comfortable position so that the steering(car) or handle(bike) is at correct distance from your hands and is reachable