I have Givi v35's on my Versys. I've always considered them fragile, myself. I expect that they will crack and crush in a crash. I even worry about them in a drop. And to any degree that they do hold up the back, they will be driving the front into the ground.
No, I don't expect any protection at all from the cases. In fact, since the cases themselves (and their mounting racks) cost $1,000, I consider them a liability, not an asset. More damaged parts to be replaced.
If it's protection you want, buy frame-mounted metal and put it around the thing you want to protect.