The only bike parts I’ve had break on me when JRA were carbon bars and a carbon seatpost. The bars were my fault as I’d over-tightened the brake lever clamp without realising (until they snapped at the lever mount). The seatpost snapped in two with no warning as a sat down after a short climb. Neither fault would have occurred with metal components. Both were decent brands (Answer and FSA). I don’t have carbon on any MTB now and certainly wouldn’t entertain an unbranded safety critical item like a fork from an unknown source.
Conversely, the only items I’ve had break JRA have been metallic. Including bars, stem bolts, frames (luckily when it’s been front triangle I’ve noticed before the crack’s gone all the way around), axles, spokes.
You do need to take care to work within the limits of composite components, but anecdotes of over tightened components failing shows a limitation of the material that you need to take care around rather than an accident waiting to happen.