What I find curious, is when jazz bassists talk about finding "their voice, tone, sound" expressing, themselves, on & on, all the while ignoring, or dismissing the most "expressive" element at their disposal... the bow! The almost unlimited "colors" of sound, dynamic qualities, and the pure singing properties one can accomplish with it are IMHO, simply amazing. I also think it is fear of sounding bad, making horrible sounds. I've heard it, in one form or another, from my students to fellow bassists. I at one time, even shared some of those same thoughts.