he reason they were used was not the limited options. The reason they were used was they created a sound that was useful for that style of music
well that and back then those were basically all there was with professional quality..if the quality and different selections of bass available today were there in the 60s I would think some bass players may have used different basses than the P..who knows..maybe not..but its tough to say...it worked so thats what they used.
