Given the varying width of real guitar strings, it's much easier to tell what frets we're pressing (and which strings we're finger-picking) on a real instrument without having to look down.
At the end of the night, you tell it you're going to sleep by pressing and holding the lone button until the Up vibrates and the tiny moon-shaped light glows.
There are many real and pressing threats to American security, and in a world of limited resources it is perfectly defensible to re-allocate funding that would be used in a field (anti-submarine warfare) where there is little apparent need towards other far more urgent priorities.