Originally Posted by JimmyM
"Been playing almost 35 years professionally and never once needed to use tab, nor have I been asked to read tab."
Same here, but for a longer time,,

Never once asked to read tab. Sheet music, charts, Nashvlle numbers, Real Book type charts, Big Band, pit band and orchestra music, sometimes either clef or "Read the left hand of the piano, will you?" Ack.
Learn to Read Music. Most of the posters here are not thinking beyond their instrument. A good bass player knows what the other guys are playing, and knowing how to read not only bass parts but Trumpet, Piano, Sax, etc., It goes a very long way towards making a player a musician. And there is a vast gulf between the two. If you do not read you cut yourself off from a whole world of music and communication with other musicians.
I can see an advantage to it in certain situations, but that would be for learning only: As an example, the melody to Donna Lee can be played several ways, in different positions. I figured out the positions and fingerings myself, and kept running into position change issues during the learning process, and it would have been a big help if I had an idea of how Jaco played it. Tab would help to shed light on the link between fingering patterns and phrasing, for sure.
And like MikeBass says, there are reasons for playing in certain positions on the neck that relate to tonality, but, like on a violin / string part, that can be indicated on a chart.