I respectfully disagree, at least in part, based on my own experience. In 1976, I entered the Studio Music and Jazz program at the University of Miami and took lessons from Don Coffman, who taught Jeff Andrews and Mark Egan, among others. His approach was very systematic, and thanks to him I made very swift progress on the instrument, especially from a technical point of view. There really ARE better, more efficient ways to play bass, adopted from both guitar technique and double bass technique -- both of which I studied, and which helped me make gains in mastering the instrument. And there are less efficient approaches that inhibit expression and accuracy -- I've seen many students come in for lessons with techniques that prevented them from making progress.
I do agree with you that the attack and the sustain and controlling them with your hands is crucial. Which is why when I teach, I include those techniques right away, as well as a systematic approach to shifting, using single-string scales.