All horses can have healthy hooves as long as the don't wear shoes and have a proper barefoot trim. Look it up, you'll be amazed about how much harm shoes cause to horse's hooves.
Love when a "barefooter" posts unintelligent unfounded comments! Being a farrier myself..most of the 450 horses I service are barefoot and are able to do that with ease and no trouble whatsoever. Shoes are only necessary when a hoof cannot handle being barefoot..in cases where hoof quality is already poor, wear exceeds growth due to quality or footing, laminitis or founder, or in an intensive work program. Shoes do not cause poor hoof health..only bad shoers and trimming can cause shoes to effect hoof health. A qualified educated farrier places shoes where necesaary to give PROTECTION! OBVIOUSLY your information is misguided and you have only viewed poor shoeing jobs. Remove your own human footwear before you preech that all horses and all hooves can go barefoot! Not all hooves need shoes...but not all hooves can go without! This is fact!
Edit...shoes may be required in certain conformation issues as well..if not achievable through a trim.