Dave, labels sell more lures! Then of course, you need technique specific rods and reels to execute each of these techniques! lol Dropshot is nothing different from a standard live bait set-up from 50 years ago, but now you need special hooks, lures, weights (Tungsten, not lead) and probably a new rod/reel combo!
To me, a Jerkbait is any long slender minnow imitating bait that can be twitched or "jerked" to simulate a dying minnow! But then, what do we know? lol