Used to be one at our barn that was named RT. That stood for Rotten Thing. She was a kook and her ground manners were appalling, but she could jump the moon.
LOL. Appaloosas are extremely smart, have a self preservation instinct that is unbelievable and most will not be told what to do. They will, however, when asked do the impossible. And if asked right, will behave like angels. They really don’t want to fight, they just refuse to be bullied.
I’ve always that if you could train and ride an Appaloosa or Arab that you could train and ride anything.