My son tapes his wrist for two reasons, first for support and second to help protect his wrist when he drops down for a ball in the dirt. The inside of the wrist, when bruised, can take a long time to heel. he also wears a 3 or 4 inch forearm band just below the elbow toward the wrist again to protect his forearm from balls kicking up from the dirt.
As you can guess, he catches for two pitchers that throw alot of hard breaking balls in the dirt.