I'm a divemaster, and I work OW classes. I go out and set the float by myself, and often bring it in as well. In addition, I would certainly not count on my students to solve any problem for me that I can't solve myself, and I am often positioned during a teaching dive so that nobody would notice if I had a problem, anyway.
Outside of teaching, I don't dive alone. It's not that I don't think I can do it safely, although at my age, it's probably not a bad idea to have somebody to notice if you just stop swimming. It's that I really do think diving with buddies is both safer and more fun -- but then again, I am lucky enough to live in a corner of the diving world where I have more buddies than I can find time to dive with, and all of them rock. The people I see on here who have decided to dive solo because of bad buddies deplore people whose skills are bad, who are unreliable, who won't follow a plan, who silt out dive sites, who don't respond to signals . . . well, none of my buddies is like that at all. When you have rock solid people with great skills, great situational awareness, great communication, and great joy in diving to dive with, well, why dive alone?
Outside of teaching, I don't dive alone. It's not that I don't think I can do it safely, although at my age, it's probably not a bad idea to have somebody to notice if you just stop swimming. It's that I really do think diving with buddies is both safer and more fun -- but then again, I am lucky enough to live in a corner of the diving world where I have more buddies than I can find time to dive with, and all of them rock. The people I see on here who have decided to dive solo because of bad buddies deplore people whose skills are bad, who are unreliable, who won't follow a plan, who silt out dive sites, who don't respond to signals . . . well, none of my buddies is like that at all. When you have rock solid people with great skills, great situational awareness, great communication, and great joy in diving to dive with, well, why dive alone?