Considering I am the farrier, I will consider hoof boots if I see excessive wear. Regarding the “myth”, the hoof color does indeed indicate potential differences in composition. In our horse KiZmet’s case, it happens to be true. Her front hooves (solid black) are denser and more brittle than her back hooves (white). As her farrier, I notice a definite difference when trimming and rasping them.
"Ride fearlessly, but think carefully"