Kim:
I believe that solo diving is a form of technical diving. As with other forms of technical diving it has it's degrees of level and difficulty. The reason that I think that it is technical in the first place is that there is no room for error - none at all. A buddy system allows for a few mistakes - solo diving doesn't.
I disagree with the basic premise here, in that there is room for error in solo scuba diving. You have time, and air, so you can figure things out. If this quote were about solo breath-hold diving, then I would agree (see my discussion on this on my thread about my thoughts on solo diving).
I've been solo diving since the...well, before some of you were around
I've made plenty of mistakes both buddy diving and solo diving. I've gotten in more trouble buddy diving than solo diving. We've got to realize that anytime we're over about 25 feet from our "buddy," no matter the visibility, we are actually solo diving (closer if the visibility is poor). I've had fins come off while solo diving, regulators leak water, cameras malfunction, lines get tangled, etc., without problems while solo diving. The reason is that there was air to breath, and time to deal with these problems.
In fact, I set up a special section of my dive log and called it "Special Problems and Solutions." This is because each dive, something goes wrong that we can learn from. Diving is a complex activity, and if we stop learning and go only by what someone else tells us is right, we stop learning. There is a term for this kind of learning--"experience." With experience we gain insight into problems that beginners don't perceive. This is why solo diving should be a part of the diving discussion. Pilots "solo" as a part of their training. If they cannot solo, they cannot receive their pilot's license. That should be considered by our scuba training organizations.
SeaRat