I know you don't, my point was and still is, if the association wants it out, what is your argument to support that your decision is better then what the association is calling for?
The reason they want it out is because, for a long time, WP is the laughing stock of ridden competitions. The last thing they need is a completely backwards training method that makes the horse useless if it is sold to a different discipline. No one ever said it was cruel (unless the trainer really uses the spur... which I've seen), but WP was supposed to be the 'foundation' for other things such as cow work, reining, whatever. There's not much you can do when the horse slows down when you ask him to go.
And wild_spot is correct... the back up is 'forward', just in a different direction. Most Classical dressage instructors will have you 'block' forward motion with some rein and your seat, and redirect the energy out the back end. ;)