Nice topic Bob, and article as well.
I generally dive with buddies, and prefer to do so. However I have found that while I may want to dive with a buddy, over the past year I have been doing more solo diving.
This is not as much by choice, but because of activities I enjoy (photography), and current (very difficult to stay close enough to a buddy in ripping current unless you tie off to one another), or because of the lack of experienced divers on board a boat.
Case in point, last summer I was diving with Gary (Conch Republic). Gary knows me. I was on a boat with a party of relatively inexperienced divers doing shallow reefs. I had my camera, and once we were in position, Gary (our Captain that day) walked up, and asked if I was ready to go well before anyone else on the boat was set. Sure, I said!
He had me drop off the side, and that was that. I was on an easy reef in 30~50' of water. I had my pony, vis was good, current was mild, and I really enjoyed the dive. I dove in this fashion most of the time we were doing shallow reefs that week and discovered I enjoyed it very much.
So why was I comfortable with this? First, I had redundant air. Second I was focused on photography, and would not make a great buddy with an inexperienced stranger. Third, as the group on the boat were inexperienced, I doubt if I had issues that any one of them would be in a position to help me.
I had a similar experience diving with Brent with Blue Waters, first in, last out, and diving the shallow reefs solo. So another benefit is extended BT.
Upon reflection of these dives, I have come to realize that in the absence of a good dive partner, I maybe better off diving solo at least under less than challenging conditions.
I did partner with a few divers on that trip on shallow reefs, but I think it was more for the comfort of the DiveOP, and my buddy rather than because I really would benefit. OTOH, on the Deep wrecks, I had the pleasure of diving with some very experienced locals, and was much more comfortable knowing I had experienced divers keeping an eye on me. In fact while doing light penetration in the Grove, I had to cut one of my insta-buddy free from a nasty monofilament entanglement. Maybe he would have freed himself on his own, but I think having others to help was a huge benefit at 110', and likely helped keep him calm knowing someone had his back.
I think solo diving needs to be examined on a dive by dive, and dive site basis. I don't consider myself a *solo* diver, but rather an opportunistic diver. If I am comfortable doing a site solo due to the conditions and a familiarity with the dive site, I no longer hesitate to do so. OTOH, I would NOT solo a site where I had any reservations and prefer to have good friends in the water sharing the experience.