Everything about rockwool/mineralwool looks great:
It doesn't burn, mold resistant, mice hate it, good R-value, etc
My only concern is that it would become the next asbestos..cough composite material cough..as if there are no other health hazards out there.
Only the pipe wrap was a true killer
afaik.
But the dense shingles were also nasty when hammered to put in trash bags and hide from government agencies.
I once read a blip about a foam product called "Spraycrete" which was similar but haven't seen much since.
A spray insulation product that is dummy-proof to use, fireproof, no nasty chemicals off-gassing, or dust when removed, sticks to application, doesn't shrink or lose values.. would be the next sliced bread.