This is a very interesting conversation. I spent 40 years in and around A systems H/J programs, and Dex was horrible. It was widely used, and everybody knew it.
I’m interested in the ‘lope them down’ conversation as well. After I left the H/J world, I rode Saddlebreds. It was the opposite. You wanted the horses fresh for the ring, so how did you work them to get them fit without losing their enthusiasm? You drive. Most Saddle Horses are driven their 2 year old year. They show as driving horses, so by the time you ride, breaking them to saddle is a non-event. And they continue driving them for fitness. It’s like Zen for a saddle horse. You harness them up, and I swear, they zone out while trotting in the jog cart.
Now I’m riding western. The biggest difference? The brain on the horse. The Paint I’m riding is an anxious type, but would still rather take a nap in the center of the ring than anything else.
Some people will always turn to substances. Others to overworking. The balance between fitness, performance and rideability is a fine line, and something each rider will have to work out with each individual horse.