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@The_Seldom_Killer
I would guess that with hydraulic there's a risk of damage to the system well away from support or civilisation. Considering the sort of distances between habitation in North America and the terrain involved, you wouldn't want to be down to one brake only and potentially having to do a lot of slow downhilling or downhill walking. Cables are relatively light and easy to replace and discs offer the advantage of allowing you to warp the wheel without losing braking effectiveness.
Just guessing, but that would be my choice and reasoning if I were undertaking such a challenge.