No problem guys,
it's up to you. You have "have saved thousands of lives by this method". But you have lost some. The others have never lost one. (with that kind of slip off)
At last i couldn't understand why you don't want to see the advantages of the safe systems. Why you would use a system with safety problems if safe systems are available? That kind of equipment doesn't cost the world.
To the german accident. The patient become unconcious and saggy during the 70ft up winch. She was wet. After that the rescuer was able to hold the patient approx. 10s inside the strop with light spinning how usual on hoist ops. Than he lost she. Without rescuer such persons slip immediately out of the strop.
I have seen the military evacuating civil persons in flooding situations with nato strop. Without better equipment they winched up kids 5-8 years in the strop without rescuer.