All good points that have been made and it is stated in the bylaws. Of course, real life decisions around this are going to vary by individual preference and comfort levels of both PH and client. Personally, I really enjoy being a solitary hunter, especially when hunting from a blind and consider myself capable of making the right decisions when it comes to chosing what and what not to shoot. With all wildlife I generally do my homework x10 and have studied African game species for a whole lot of years in order to feel the level of confidence knowing what I am seeing in the wild. That may come from my lifelong interest, a wildlife biology degree, experience working in a state game department, taxidermy interest and a keen eye for scanning for individual trophy quality.
That being said, I can also easily see where having a host PH present will enhance the experience for many hunters who are unfamiliar with the various African species, dangers and unique pitfalls. Not to mention clients who are simply less competent or inexperienced as hunters, who have the potential for making major mistakes like the sable case stated above.
Given the reality of most PHs not being able to be everywhere at once, I would hope that good decisions will continue to be made by them regarding which of their clients are capable enough to be left in a blind unattended vs. those who should not/never be. I imagine having good indepth discussions with your clients prior will help to sort out most of these types of decisions.
If my PH insists on his being with me 100% of the time, I would never fault that kind of decision in light of the existing law, but I would tend to look elsewhere for someone who has a little less of an aversion to perceived liabilty risk the next time around.
Just being alive is a risk...I beleive one should live it to the fullest when you can.