You can get in a car and drive it and not know anything about the parts that make it work and in time you may be able to drive as well as any race car driver.
So lets say the car breaks down you pull off the side of the road open the hood and see stuff. You have no idea what any of the parts are or how they work together to make the car move. Even if there is a simple fix that will get you back on the road, you can't see it.
Whether you are driving a car or your fingers on a guitar neck, the more you know about anything you do, the better you will be in the long run.
