I can see that and I have no professional training. Just always been taught to keep the chamber empty until ready to shoot. I am not usually one to carry the rifle in my hands at all times, especially on long hikes and hunts. If it was in my hands at all times I could see that but even then the unloading and reloading when jumping on ledges and crags or crossing creeks and such just isn't worth the hassle for me. Of course if you're one that doesn't unload for obstacles with one in the chamber that is a non-issue.
But you won't find me on 10-20 mile one way approaches with the rifle in my hands ready to go when I don't expect to see a sheep to hunt for a full day atleast.
Great thing is its a free country and we still can choose to do it how we want. I just don't see the need so I don't, many apparently do and would have lost elk otherwise. Training one to rack the bolt vs. flip the safety if its already in my hands is a fraction of a second difference in reality so if that was the difference I guess it wasn't meant to be in that extra fraction of a second. I have seen folks squeeze the trigger at game with the safety on too and wonder what happened too so nothing is fool proof no doubt. I have have safety's become flipped to fire and such walking through the brush. ( and yeah so long as your finger or anything else stays off the trigger (branches and such) and the muzzle is pointed in the right direction then even if it does go off its just a scary loud noise, but I'd rather not have that either.
Certainly neither is "wrong" we all make the call on what we feel is needed or not.