> There is no evidence that the case is designed to act as a heat sync and a skin is unlikely to change that.
My college education is electronics, worked in the field, mostly digital with a little analog, my whole life and am now retired. I don't need a big sticker saying "heat sink" on the aluminum back

It is being used as a passive heat dissipation means, no question about it. The decal does impede heat dissipation to a degree. I do agree, probably not a lot.
Bottom line, do as you choose. My vote, turn this thread back to the cool pictures of the "Pro's" out there.
PS These things better last more than two or three years.