The “spectacular trots” that the WB’s are currently judged on is just because dressage judging has now devolved into a materiale class that focuses on a gaboinga trot almost exclusively.
When the L-program states that “You start with the gaits…” then dressage is no longer a test of the horse’s training.
I like the video upthread because it shows how much better a “dressage” horse moves when it is not held onto its face and the rider rides from the seat.
The “refiners” harken to a tradition of a working horse who had to follow the rider’s eye to see what calf would be cut. In the PAST, (the very long-ago past) dressage was a test of the horse’s training. Not so much now.
I believe that any rider who wants to learn how to improve their communication with their horse can benefit from any horse training that focuses on light aids and clear communications.
Just a fun event.