If the horse doesn't look right, then something isn't right. Its that simple.
I used to compete in Endurance. I liked the fact that my horsemanship was being tested. My aim was to complete the course with a horse that was in excellent condition and happy with their work.
Barefoot does that for me now. It tests my horsemanship. If I fail the results show in the feet. Much more quickly than they might elsewhere, and the marks on the hoof provide a timeline of my successes and failures.
Of course the rest of the horse is a reflection too. A poor coat, a rib showing that shouldn't be. But these are relatively easily managed and past successes and failures are not recorded. A good foot on a metabolic horse is more challenging.