In case anyone got the wrong impression, I totally disagree with the quote I posted above. Read the quote again and think about the history of music, the bass players that played for Bach, Mozart and Beethoven, Parker, Davis and Coltrane, the Grateful Dead, Frank Zappa and the Allman Brothers, Stax, Muscel Shoals and Motown, the Mahavishnu Orchestra, Return To Forever and Weather Report, Yes, Emerson, Lake & Palmer and King Crimson, etc. etc.
In my opinion, to say that the E and the A string is all a bass player should need to do the job properly is to ignore the history of music and the role that bass players have played in that history. Because the statement infers that the work of every great bassist from Mingus to Wooten has not been done properly, the statement is on its face patently absurd.
But that's just my opinion. Others will have different views on what constitutes properly played music.
And yes, I use all the notes; and I use them often.