It may be inherently flawed, but we can’t just arbitrarily emit wavelengths of light with current technology. Realistically I doubt we ever could, we would need to alter the emission energies of materials on the fly, which would be akin to actual magic. It is frankly amazing it works as well as it does notwithstanding.
I would like to point out that actors are usually contractually obligated to maintain a specific appearance. Stamos may literally have not been able to shave his head in solidarity, so while seemingly noncommittal I think there could be more to the gesture. As you say, Dave is the only authority on the matter either way.