Disk brakes and big steep hills

[smifffymoto]

Are disks still not recommended for alpine type road descents?

[smifffymoto]

Overheating and brake fade are cited as the reason used to be the reason for not using them.
Is it still a valid argument against using them?

[smifffymoto]

I started this thread because a friend,whom rides 20000km a year, mostly in the Pyrenees, won't use disks because of the overheating and fading stories.Michel is nearley 70 years old and lives bikes.
My tandem has the best brakes ever,rims are Andra with css,Shimano deore v-brakes with Swiss stop blue blocks,rear is a drag brake.The main rear is the biggest disk and caliper Hope make.

I'm still undecided to be honest.