Height is not really the issue with jumping, frequency is. As young horses, we generally do not get a whole ton of indicators on athletic ability and what their final potential may be. Generally speaking we don't truly know if a horse is a GP horse until they get there. But things like jumping scope and movement can be evaluated at a younger age, while confirmation will change until they are done growing. So we do things to challenge the horse's ability while it is young to vet an idea of if the horse might have the things we want to do the big stuff. Young horse inspectors have the best feel of this, so inspection results are a good indicator of how a horse may do later I life. And that does involve jumping some big stuff as 2 and 3 year olds.
That being said, they shouldn't be frequently worked hard at 3. Imo 4-5 tines a week for 20-30 mins is lots. But one can still do a lot in that time, and shouldn't stagnate the training.
In dressage, expecting the horse to be at a moderate level with flying changes and collected gaits by 6 is bot unreasonable with a talented and athletic horse. To be at the small tour at 7 or 8 and the GP at 10 is I would say normal progression for a talented and athletic horse. I find far more issues with stagnant training, because when you go to move on, the horse objects and throws a tantrum because he was never asked to put in effort before. Behavior problems start when we think "oh nice horsey didn't buck me off - good boy!". Ask for improvement and change every ride. Keep the brain engaged.
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