Again about the one sided arguement, LDR is a training technique that has been around longer than anyone you know has been alive. When done properly, in short periods of time, and in extremely experienced hands for some horses in some situations it can be beneficial. I am willing to bet that none of you have ridden a horse at hot as Salinero, or any other Olympic GP horse that is winning at that level. And I'm also willing to bet that none of you will ever ride at that level either, so you shouldn't be bothering yourselves with this whole notion anyways.
Now, this doesn't go to say that I encourage the use of this technique or in any way condone it. All I am saying is that, like many other techniques there can be a time and place for these things. A one-rein stop for example, shouldn't be used to stop the horse all the time, and on some horses never has to be used. But certain times on certain horses, it is a very good technique.
I personally have seen LDR used all the time by people who have no idea what they are doing and it is disastrous, the horses are unhappy and usually lame. I have also personally seen world class riders use the technique sparingly with wonderful skill to excellent results.
I have also seen Anky ride in person. I watched her warm-up. She really over-hyperflexes and is not someone I would say who uses LDR as a technique, but more as a control mechanism. She is a better rider than all of you, and me, but her horses are very very hot and that is I think the only way that she herself can control them. Is she the number 1 rider in the world? No probably not. I imagine that there are a few other riders in the world insane enough to get on those horses, and out of them maybe a handful that could ride them better.