Adding further, one must take note of horses that have been ridden ldr/hyperflexed and then are trained to reach for the rider's contact instead of backing off it when applied. It's a pain in the neck, literally. The horses have immense trouble reaching for contact and remaining on the vertical instead of dipping noses behind and moving round yet far from swinging through.
To say you can see some success with the method of ldr is like saying you can see some success with anything else. I see a similarity to how people teach their horses to "dance" by whipping the horse while it is confined in cross ties, and keep whipping them until they prance in place on cue. They have poor rhythm and are tense, the movement is not from good training but from only the horse's genetic potential.
Imagine, with a sensitive horse, you don't need to whip it so much to get that result. All needing to be done might be to give it a few taps or spook it a few times.
Yeah, this is a shallow post.