What @exvet and @fivestrideline said.
Nobody said anything about producing horses that aren’t capable of upper level sport. But in case you need a more concrete explanation, @Warmblood1, you can (for example) show GP locally and get scores in the low 60s… but that same horse is never going to be competitive internationally and get scores in high 70s. Is that clearer?
The… well… original title of this thread contained the term “world-beaters”. While that may have been slight hyperbole, the point was not lost on most of us (but it seems to have misinterpreted by you and a few others). You can breed a horse that is perfectly capable of upper levels and that is easier to ride, handle and train than a tall, heavy, big-moving Warmblood. It just won’t get the “wow” scores. It’ll get decent scores. And maybe it will have other things that you value in a partner, like an active, inquisitive personality, that is so eager to learn that they will turn themselves inside out trying to predict what you’re going to ask next, that responds with the lightest feathery touch of the leg or seat, that does not need to be ridden with spurs, etc.
I am sorry that you seem to be wringing your hands over what you perceive as a growing anti-Warmblood sentiment, but you need to just accept that there will always be people who are passionate about other breeds and champion their talents and abilities in the Olympic disciplines, and there’s nothing wrong with that. Variety is the spice of life.
Also, European Warmbloods were originally intended for cavalry, not sport. You would do well to remember that. Breeding goals can evolve, Warmbloods don’t have a monopoly on that.