I have to concede that that's sort of beyond my level of expertise.
I will acknowledge that the first comment you made is spot-on. Belts will mitigate, but not eliminate, injuries. In fact, you see different injury patterns depending on the type of belt being worn. Certainly, as I mentioned, there's actually what's called a seat belt syndrome, where only a lap belt is worn. There's also the concern if a three-point restraint is worn inappropriately or isn't fitting correctly that you can potentially have more significant injury than if it weren't worn at all.
Again, any other sort of technology is a little bit beyond my expertise, so I'm going to stop my comments there.