24v is only a little more dangerous than 12v, but so is 48v only a little more than 24v, and 110v only slightly more than 48v. One has to draw a line somewher

24v is only a little more dangerous than 12v, but so is 48v only a little more than 24v, and 110v only slightly more than 48v. One has to draw a line somewhere. 12v barely penetrates dry skin, and won't do anything across even a cotton shirt. If that is enough for powered windows, why change what isn't broken. As for first responder training, assume they have none. The first person at a scene will be some rando person reaching in to pull a kid out of a burning car, or it is that kid themselves climbing out of the wreckage.