I agree on quite a few points...
Violet action - I fish with a friend who's 83 years old... unbelievable source of knowledge... one of his favorite techniques is 1oz-1.5oz jigs pitched into 3 foot or less of water on inside weed edge. For years I laughed at why you need 1.5oz jig for 3 feet or less... yet he consistently catches bigger fish than me... I've come around to thinking in some instances that "violent" splash and super fast drop to bottom is irresistible. Like a dog chasing anything that buzzes by like a car, bird, toy, etc.
When it comes to soft plastics - the great thing is you can really detail your lure to how you plan/desire to fish them. If your planning to crank/move them alot - you can use thicker sections and count on a good amount of resistance to move/provide action. If you plan to let them slowly sink weightless... adding fine appendages, areas to gently quiver helps..... I tend to try and add both to any lure I make... just a preference... and like anything else - sometime I think I have it - and sometimes the fish just ignore me.
J.