I wouldn't call them useless at all either. Where they are dangerous is when they have a failed ascent and you go to stall start them. The problem here is without the CDL locked when you do the stall start the front doesn't have enough traction , and with an unlocked CDL the rears rotate coming down the hill but the fronts remain locked, which causes a gross loss of control in the decent. Of course it can happen when things are really steep, but its the greasy type clay where it seems to happen most. There has been a few people come unstuck like this, and is ultimately why LR reintroduced the CDL - the ETC couldn't overcome the problem.
Interestingly a similar thing happens on decents, where if you lift a single wheel, or a single wheel loses traction, then all of the tractive force that is producing the braking from the engine is lost through that wheel - so you take off until the wheel grabs traction again.


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