My opinion, the filler doesnt concern me either but the state of the feet is not the farriers fault it is what its being fed, lacking terribly in nutrition, needs a good hoof supp. Get the filler taken off and trim regularly as horses feet will grow quicker its natural to replace the lost hoof rasped away also keeps the hoof tight, i would be concerned about the bullnose which would be from long toes that instead of flaring forward has bulged from the coffin bone, so keep toes trim and the laminae will not be stretched.