I think what everyone really wants to know is the classic "Why?" I assume that the NFHS had to have some reason for implementing a rule of all-white jerseys with no colored highlights, piping, etc. A simple explanation of how a colored highlight on a home jersey would affect the integrity of the game would surely appease all those who are upset by this rule.
If it is an issue important enough to make a rule, surely it will be easy to provide an obvious and satisfactory reason.