Carbon fiber is stronger than steel. But there are different types of strong. A bike is a weight-bearing machine, and in that sense, CF is great. But it has poor impact strength, which is why it's prone to not surviving crashes. ( Although, in fairness, I've totaled an aluminum frame. ) It's great for its intended purpose - riding - but if the wind blew it over while you were getting your lock ready, that could spell curtains.