Asking why you’d shave your head when you don’t “need†to is like asking why someone would wear their hair short, when they COULD grow it long. Or why they wear it their natural color when they COULD have it any other color they like. It’s like asking why you wear a certain style of clothing, when you COULD wear a number of others, why you choose a hamburger when you COULD have tacos. It’s a choice, an option a preference. The most important reason you should ever change your appearance is because you want to and because you can. No “better†reason is required or exists.