LCD screens are highly vulnerable to scratches, especially when touch-based software is used to interact with the computer. The repetitive tapping in a certain area or the use of sharp objects to peck at the screen will create dead spots and reduce its life cycle.
As the top is opened and closed, the keyboard rubs against the LCD screen and can leave permanent marks and scratches on the screen. Inserting a NuShield screen protector over the viewing area will prevent this and extend the life of the screen.