That's good, so long as there isn't too much slack. The situation of too much slack means that your body will travel until the slack is taken up, then in a short time, well F=MA, shorter the time the harder the hit. But I know that you know that. Just saying that for the smaller gorillas in the room.
What the belt is supposed to do is tie your body to the car body, which together rides down with the car crushing in the impact. If those two bodies get un-linked, then after you run out of slack, you ride down with the crush of body fat or distortion of the belt system(there's not a whole lot of that), or the max-g of the belt as designed. That max-g is way above the ride-down of the car in crushing, but supposedly below the death-g rate(my term for it).
And too, if that F=MA situation is too fast, there is the impact on your neck. It's kind of bobbling around above your shoulders, and an extra snap to the initial event isn't desirable.
For side impact the looser you are the more your head will swing about in the cabin. These days airbags should be the overriding control of that, but every little bit hurts(helps?).
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