I know I've read numerous studies back in the day that indicated a plastic worm is one of the hardest lures for a bass to learn not to strike. Its not just that it looks like a meal, its that it looks more like a meal than many of the other presentations we use. There aren't many constants in fishing, but plastic worms and jigs have continued to be reliable producers of decent to large fish for quite some time, the same can't be said for many other lures.
I, and I doubt anyone else here, really knows how a bass perceives its world, and how the lateraline, vision, and whatever other senses it uses really work. I have always been under the impression that the lateral line was useful to make it aware of movement in its area, kind of an early warning system, but it still relied on vision before deciding to strike. I cannot say that is true, however. What I am certain of, is that bass can not only learn to avoid certain things, but at times will selectively feed only on certain items. I don't care if you're talking about smallmouth during a hex hatch or largemouth keying in on shad, there are times when its useful to know what you are trying to represent. That doesn't mean you need an exact replica, but something close enough for the fish.
And as far as wacky rigged worms looking like a dying minnow, drop some half dead shiners down a hole when you are ice fishing and watch their action, or look at the unhealthy alewifes near the pierheads sometime.
Getting into what a bait represents to bass and what will trigger it to strike are two different subjects, I've watched bass ignore live crawlers more than once just to hit a finesse worm. Surely the crawler represented "food", it just didn't have the right characteristics to trigger a strike at that time.
My point is, saying a worm looks like a "meal" is a bit of an oversimplification, same as saying bass strkie out of curiosity or whatever. I happen to believe there reaches a point in a bass's life where it pretty well knows what its looking for in a meal, and a worm still works at that point.
But, personally, I'd rather kick my trolling motor on high and chuck spinnerbaits or cranks all day, simply because that's what I happen to enjoy. I know what I've read and observed, and what has worked in the past, though.
I also believe the average fisherman would rather just buy cool new stuff than give any real degree of thought as to what is triggering the fish to strike.