We run an estate car with a carbon composite shaft. It does say 'don't use if dropped', but I haven't heard of failures. I reckon composites are not all equal. When I've worked on laying up, mainly fibreglass, I've always added extra for 'peace of mind'. The rush to lightness, a major marketing factor, surely pressures some to take a short cut? I reckon it's good sense to stick with reputable makers, as Russell says. I wouldn't ride anything so 'high tech' these days though. I want something I can throw about, and drop as much as I like.
I am sure some must have mentioned the most prevalent innovation that isn't; GRAVEL BIKES!