@aupatking Perhaps they are thinking about potential liability if the "guard" did not work as a user thought it should have and allowed an injury to occur that the user thinks should have been prevented. Or made an injury worse. We live in a litigious society. The next question is "should the handle manufacturer warn of the danger". Head through the handle is a danger that is not open and obvious to an inexperienced skier, but it is well known to those of us who have gone out the front a few times. So, should the handle manufacturer warn? Would failure to warn create liability? Perhaps handle manufacturers should warn of danger and offer to supply a guard. It's a bucket of worms. The initial answer depends upon what particular judge/jury you get. Who knows what happens on appeal?
If slalom skiers could remember, during a forward fall, to hang on to the handle with one or both hands until the boat pulls it away, there would be fewer through the handle injuries. That is easier said than done.
Slalom skiing can be a dangerous activity. So is walking across a busy street. Life is full of risks. We have to accept some risk if we want to enjoy life.