Rosie, in my opinion, the buddy system was very good as originally contemplated, and still serves a purpose. But it has been perverted to allow more people to walk on a boat and dive.
Unfortunately, in my opinion, the "buddy" system is used on boat charters for convenience to allow everyone to dive. Pick-up buddies can be very dangerous. Even if they didn't mean to be. The difference in ability between two buddies can lead the pair into dives where one of them is not prepared.
After several "buddy from hell" dives and situations where I had to personally rescue or assist a buddy (or two), I have decided I will no longer go on boats as a "walk on" customer. So to answer your question, good buddies can do basic rescue of their other half. But bad buddies don't do rescues, and even endanger the other person.
As to what the public will pay for, in my view, most of the public don't have a clue what they should be getting when they walk into the LDS. It is up to us professionals to be responsible and make sure they come out of the door as responsible safe divers.
Unfortunately, in my opinion, the "buddy" system is used on boat charters for convenience to allow everyone to dive. Pick-up buddies can be very dangerous. Even if they didn't mean to be. The difference in ability between two buddies can lead the pair into dives where one of them is not prepared.
After several "buddy from hell" dives and situations where I had to personally rescue or assist a buddy (or two), I have decided I will no longer go on boats as a "walk on" customer. So to answer your question, good buddies can do basic rescue of their other half. But bad buddies don't do rescues, and even endanger the other person.
As to what the public will pay for, in my view, most of the public don't have a clue what they should be getting when they walk into the LDS. It is up to us professionals to be responsible and make sure they come out of the door as responsible safe divers.