Yeah, the Cavallo hoof trimming article produced a very "pretty" trim, but in my opinion, at least with my horses and riding in the rocks and such, I would never take sole off the bottom of the hoof unless it was coming off on it's own and I was just helping it along. And I really don't trim the bars unless they get long, and I don't go cutting around (or rasping) into the sole either, especially if you take the hoof wall down as short as the sole. ( I normally try to leave a little hoof wall too, and not rasp the wall down right into the sole).
So yeah, the trim was pretty, but unless your horses are tougher than mine, they WILL need hoof boots after a trim like that. I honestly don't see why they were trimming the sole at all in that article. Although it created a pretty trim.