There's physical technique and there's musical sense. One you get from repeating exercises, the other you get from not playing at all, instead it involves years of listening to all the other instruments apart from your own. One is more important than the other. Youtube is chock full of people with astounding physical technique but that's not the important one, imo. Of course, you've got to be able to play the killer bassline but the real skill is having the vision to put the right notes, rhythm and feel to create it in the first place.