Well, I think it is a great idea
Kudos to SC for thinking outside of the box.
The other thing is that there are a LOT of kinds of granite. The kind used for countertops is often picked for the grain/color etc, not for the strength and or durability.
Here in Japan, we have this kind of Korean food, it is rice and a bunch of veggies etc, all put in this stone bowl, and the heated up HOT.
I've seen these bowls used for YEARS at restaurants, I've even seen them dropped on a hard tile floor, and they did not break.
I saw a show here on TV where they went to China (from Japan for a stone bowl for Korean food....
) to make these bowls, the are turned on a lathe
and only the right stone will do, while turning them, the old guy running the lathe would listen to the sound, some times, he would stop the lathe and toss the bowl away. When asked, he said it was no good, to prove the point the tapped the bowl with a steel hammer and the bowl would break apart, the bowls that passed the sound test, they were HIT with the steel hammer and it rang, but did not shatter..........
SC seems to be getting a good rep, so I hope they have thought this one through, could be very interesting!