Scout, thank you for educating me about a bit more of the English world
I don't like the looks of the horse in that video at all. It looks tense and the movements look pretty shoddy to me.
One thing I was thinking about the other day is the basest differences in English and Western riding that goes even beyond the tack and all that. Most folks who ride English; whether it be jumping or dressage or XC, want elevation and suspension in their horses. They want them to be what I consider "above" the ground.
On the other hand, most folks who ride western want their horses flatter and lower, ready to suck down into the ground for a hard stop or a quick turn or in preparation for the force of a cow hitting the end of a rope. Taking a western horse and giving it that "above the ground" movement defeats the entire purpose of having a western horse.