Steve, what you say makes perfect sense on many, many dives you will be on. It doesn't necessarily apply to the blue hole dive because of the way some of the dive operators/dive masters make you dive it.
For instance let's say there are 8 people on the dive and 4 of them are lone divers. You may find the dive master does nothing to promote buddy pairing on the dive, which is because they don't care about buddy pairs, they instead plan on running the show, watching all divers and dealing with the issues that will come up such as unexperienced divers running out of air, panic, etc...
You put newer divers on that dive boat, they jump in without a specific dive plan worked out with a insta-buddy besides what the dive master forced on everybody, you get down there and suddenly you're faced with making a decision at 130 ft... do I stop going deeper with the rest of the group to a depth I'm not confident doing or do I abort them, abandon them and watch them disapear and suddenly I'm at 130 ft alone. This is where the blue hole dives differ in what you and I would say, hey, you're responsible for yourself.... some of these operators run a specific dive designed for the dive master to run herd on the divers and puts divers in difficult situations with difficult choices to be made.