MTB discs may well suffer fade on big Alpine descents but a rim brake setup would be A LOT worse. You may well be dead!
What a load!
If you could have disc brakes on a road or cross bike without a significant weight – and in time – cost penalty, why would you not want them for any reason other than knee-jerk conservatism and some odd traditionalist loyalty to ‘the way things are supposed to be’?
Because they will overheat and long descents, unless they are big and heavy.
Why do people think that just because a brake can lock a wheel, they must be powerful?
or be comfortable to use for prolonged periods. or the only option.
Err, well my calliper brakes are comfortable on long alpine downhills, and provide enough power to stop at the limits of traction in all conditions. I can’t really see what’s wrong with that?