I know nothing about horses. I rode a horse (or maybe it was pony) once, and that was an embarrassing experience (for me, not the horse). 
I've watched some of the "Animal Cops" programmes on Sky and I've been impressed by the farriers, who do such wonders with rescued horses, even though I wince while watching and have to remind myself that treating a horse's hoof is no different from a human having a pedicure.
But what about wild horses? There must be some, in various places in the world, who never see a farrier in their lives. Do their hoofs get worn down naturally? And can they cope throughout their lives without ever having shoes?
Yes, you can tell I'm ignorant. But if I don't ask the question, I'll never know the answer.