First off, Rick Gore is not very well liked or welcomed here, so comparing ANYTHING to his testimony isn't very well received.
Some horses need shoes for a variety of reasons, we as humans have bred and worked horses in a way that is unnatural to how nature created and intended them to be so we must make up for that interference and give them hoof protection when they need it. Many horses do well barefoot, but they are usually happy hackers or pasture pets (like mine) who do not wear their hooves down abnormally fast or really change the terrain from where they live 24/7 and where they work.
Shoes/boots/hoof protectors are just another way a good horse owner makes up for what we take from our horses. There is nothing "Bad" about a correct shoe job except maybe wasted money if the horse didn't need it
I myself prefer barefoot, just one less thing to worry about.