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@Dammit
It'd be an interesting comparison if someone actually worked out the kinetic energy being turned into heat for an MTB going down (say) a ski-slope in the summer, and a road bike going down the same mountain via the roads.
As a percentage of the total system weight a 15lb road bike isn't so different from a 35lb MTB.
I'm 171 pounds, so with roadbike and kit probably 190? Me on an MTB would be (say) 215.
The MTB would (assumption!) see fairly frequent braking whereas the road bike would see repeated, heavy but relatively infrequent decelerations from ~50mph down to 15mph or lower (hairpins).
I cannot help but think that there is a reason they fit rally cars with much bigger brakes for asphalt courses.