Yup…MOST of my even green event horses DO their changes. They are OTTBs who came to me with decent changes already installed.–as they do install those at the track.
On my current horse…he is a flying change machine…he is about to move up to Prelim…and it DOES make the counter canter a royal PITA. Equ kids are NOT doing counter canter in small dressage ring…and I know a whole hell of a lot of Eq kids who also don’t know how to properly do counter canter (the really good ones do though).
Again…the focus and priority is about balance. And a 3 foot fence is NOT a big fence. Most reasonably athletic horses will change or can happly jump it from a cross canter or whatever. I agree with Astrix…I care FAR FAR FAR more that my horse learns to take care of them self, balance themself and jump whatever fence I point them at and leave it up. When you focus on balance and forward…MOST will change anyway but unlike hunters…we just do not get as worked up about the change. We do care far more about jumping from a balance—and while a change does make that easier, is is absolutely not a requirement.