I'm having a hard time deciding why I should memorize the fretboard. I mean, If I'm playing the key of A then I know that one of the boxes is 4th string 5th fret, the A is 4th string 7th fret and the other two notes are beside those on the 3rd string. If I know where the A pentatonic scale is I know where that box is. Then there is another box starting on the last two notes of the first and second strings of that scale. Now I have two boxes. Another is over on the 5th and 6th strings but they start two frets up from the pentatonic scale. Am I missing something? If I know where each pentatonic scale is then I automatically have the boxes for it.