This whole debate is nuts. News flash! Via different pick materials, location played along strings, and tonal controls, one can get everything finger playing offers plus all the ordinary benefits attributed to pick playing.
I'm honestly not sure why so many people are so passionate about pick playing, I just don't get it at all. Are you like all cardiac surgeons or something, callouses on the right hand would inhibit your ability to save lives? If so, I'll conceed my points, but for everyone else, picks are limiting plain and simple.
I can get the same pick sound with my right hand fingers technique, so at a fundamental level, you do not gain anything.
Consider what you are doing when you play with a pick. You are taking 5 versatile picking/plucking apendages and replacing them with one, a single piece of plastic. It makes no sense on that level. Can't play simultaneous double stops with a pick. Can't play a warm, fat and round, ambiguous, tone that creeps up on you. It's always the full range of harmonics for the note you've picked, like a primitive harpischord.
I hope you're not too offended, just mildly. I feel an almost duty, especially to the student players coming up, to put all of my thoughts down for the record. If all you play in is a surf rock band or whatever band enjoys that sound, it's limiting if you ever want to branch out and play other music. You'll not see a pick playing bass player in a stage band on a cruise ship or pit orchestra of a playhouse for instance. That kind of music, the kind that pays rather consistently, will call for the subtle nuance of fingers.
Ultimately I'm not trying to be too elitist and I've heard pick playing done very tastefully and I believe it has a place, it's just a pretty limiting place for bass players especially.
