Carburetors are mainly susceptible to icing in normal use. Your engine can just start losing power and rapidly quit. I once had carb icing in Hawaii at 2000' n

Carburetors are mainly susceptible to icing in normal use. Your engine can just start losing power and rapidly quit. I once had carb icing in Hawaii at 2000' near Wheeler due mostly to humidity, and it was only thorough training that allowed me to figure that out fast enough to apply carb heat and save the plane. A lot of inexperienced pilots just ride it down into the ground. Dual fuel injectors prevent the icing problem (usually, unless your fuel actually crystallizes or freezes), but they have other failure modes like dirt or wear. Or forgetting to turn them on.