You're missing the point: The claim for magic tone is either true or it's not. It's not a matter of "opinion."
It's not merely that there is no way that the claim for magic tone from finishes on a massive solidbody can be proved, nor is there any persuasive evidence for it, there's no logical basis even for the claim, which simply defies common sense. It's a myth based on the grossly misunderstood importance of finish in fine acoustic classical instruments.
Nobody in tech at FMIC believes a word of this nonsense (I know, because I've discussed it with them), but this myth has eventually been recognized as an exploitable marketing angle. It's easier to pander to pervasive ignorance and make money from it than to try to educate the unwilling and impenetrably stupid at your own expense. Bubbas believe there's a difference, so by all means sell them what they want and tell them they're right.
It's like Gibson putting Orange Drop bleeder caps in their better guitars, the Bubba imaginary advantage of which is also based on a misunderstood actual benefit in a completely different application. Gibson knows there's absolutely zero technical advantage to it, but the Bubbas believe there is, so why not drop twenty cents to attract them to some otherwise wildly overpriced product?
Etc., etc., etc. While we're at it, let's sell them some magic guitar cables, too.
Extraordinary claims require extraordinary evidence -- especially when what you claim flies in the face of logic, common sense and received scientific knowledge. The Bubbas have no such evidence for these various myths any more than they have for abduction by space aliens.
If you can't provide evidence, you should at least have a plausible hypothesis, but they lack that too.