I am an eventer, and my background is different, but I was chatting with a competent, aged-out junior H/J/Eq rider today. Our perspectives on ace usage were very different. I feel ace under saddle is only acceptable in rehab situations-- such as the first few rides after stall rest during recovery from a bowed tendon or some other serious surgery.
The H/J rider firmly believes that no horse should ever compete with ace, but based on her upbringing, it’s acceptable for non-competing horses. It’s acceptable use for green/nervous horses to “get a good experience.” It’s acceptable to use if the rider (perhaps a weak kid or anxious adult ammy) doesn’t have the knowledge/skill/strength/mind to handle a tense horse in a show environment. It may even be ok to use at home on rare occasion to give a safe lesson on a cold/windy day. While she doesn’t agree with it, she’s also seen it used daily for certain hot/difficult horses in regular training.
This mentality is miles away from where I came from. I was taught no horse should need ace to be ridden; it needed a different rider or a different program. Maybe the young horse needs to NOT be ridden at the show, but just hang out at the trailer or walk around in a rope halter and see the sights. If the kid can’t ride the horse at shows, it stays home until they are safe, or trainer shows the horse…or kid needs a different horse. “Training” with ace is a wholly unfamiliar concept to me-- the only thing I can kind of relate is the few foxhunters I know who ace a horse it’s first time out in the field (and I don’t particularly agree with that either, but for some it’s standard practice).
I really respect this H/J rider and appreciate listening to her experiences. We just seem to come from vastly different worlds sometimes; riding with ace as a regular thing is completely foreign in my experience.