I've not seen any issues with random catastrophic failure like that in MTB land. Maybe it's because the parts are generally laid up much stronger than road? Wheels will break if you mash them into a rock, and even then Santa Cruz notoriously has a line of rims that Danny Macaskill had to ride down stairs repeatedly with no tires on to break.
With the ubiquity of frames at the high amateur level, if there were still issues you'd hear more about them.
Re CF frames... one neglected point is that even when you do crunch them into a rock, they're repairable, whereas Al frames aren't worth repairing due to the heat treat needed. My own CF XC MTB has a repaired chainstay.
With the ubiquity of frames at the high amateur level, if there were still issues you'd hear more about them.
Re CF frames... one neglected point is that even when you do crunch them into a rock, they're repairable, whereas Al frames aren't worth repairing due to the heat treat needed. My own CF XC MTB has a repaired chainstay.