You know, it's not just dressage, this happens in all disciplines and I see this all too much where people want results, and they want them NOW. They will move faster than the horse is able to, and will use whatever gadgets necessary to get there. My OTTB jumper I started in dressage (I make anyone that trains with me show training level before they are allowed to show jumpers) and we spend the entire first full year I owned him not cantering under saddle. Trot trot and more trot and people thought I was crazy. When we DID canter, it was awesome b/c he was balanced and supple and conditioned and trained properly and that made a huge difference.
So many other people though would have just put on draw reins and gadgets and cantered til he got it "right". Not that I'm against draw reins or training aids either but I DO believe that training MUST include proper muscling and work to support the mental discipline that you are teaching the horse. Shortcuts often end up with false frames and improper carriage.
Dressage is just one of the many disciplines that uses a shortcut as a means to an end, and unfortunately as long as judges reward it, it will continue.
Interesting video for those of you who DO understand dressage and the importance of partnership training and the fundamentals started by Xenophon ages ago as opposed to so many of the shortcuts out there today: