Trailhorse, I have to disagree. While I do use the Epics with my barefoot Appy, I don't think you would have any more of an issue riding in them with a horse with shoes as opposed to a barefoot horse.
In actuality, you could very well be right and I could be wrong. But if the horse is already stepping on himself, I would be trying to shorten the toe on the front, not make it longer. In theory anyway.
Also, my personal belief is that if the horse is stepping on his shoes something is wrong with the function of the foot, ie, the breakover is not correct. OR, the farrier could just be plain sloppy and is leaving too much shoe for the horse to catch with his rear feet. But the farrier doesn't want the horse loosing shoes all the time either, so I bet he doesn't have much excess shoe hanging out on the front feet.
So that is why I think the front feet need to leave the ground quicker. The boots may help keep the shoes from getting ripped off. Or it could cause the horse to stumble and fall down if he catches the boots and they don't come off as easily as a regular shoe would. So I dunno. We are all taking our best guesses.