No horse is problem-free. No horse is perfect. If you are looking for the perfect horse, you are going to be disappointed because the perfect horse is looking for the perfect owner and “you ain’t it”.
One of the things I have heard coming from the mouths of other trainers, instructors, and clinicians is, “I learned it from the horse,” or “Everything I know was taught to me by the horse.”
There are as many ways to train a horse as there are human languages. Put a horse in an arena and ask two hundred trainers how to work it, and you’ll get two hundred varied responses.