Unironically a good idea. I can see these really helping to increase the chances of memory survival in camera applications where the camera has a high chance of being physically destroyed. Also a metal body reallllly helps conduct heat out of the flash, which will increase their lifespan in continuous-write applications.
Stainless is extra bad at conducting heat considering it's a metal, but it's still way better than plastic. I hope they make an aluminum version at some point.