Breaking a tib-fib isn't hard to do, especially in a twisting fall like he had. Another guy I skied with in that same group broke his front foot tib-fib when the same kind of twisting fall happened but he was lucky that only the one leg let go. It's a lot harder to deal with recovery when both legs are out of commission. Both of them went to release binding systems after their falls, one on an FM and I can't remember the other. Leg and ankle injuries due to non-release binding systems happens often enough that there are plenty of threads on BoS about them happening. Yes, bad things can happen in any system and it's always good to let go to ski another day. This is a fast sport and bad things can happen faster than a person can react. In those cases, the safety equipment between your ears is ineffective.
Everyone should ski the binding style they want and feel comfortable with, it doesn't influence me one bit. I personally don't care if Joel uses that system or if Manon has a strap on her RTP, it's their decision. I use the MOB with RTP because that's what I'm comfortable with after breaking my ankle in a previous wreck. That's what gives me enough confidence to enjoy this awesome sport.