The article posted in the O.P. is a good one. And, each of us probably to some extent reads into it what WE want to believe Halstead was saying. But, the process of 'reads into' reasonably requires that we read the entire article, not simply stop reading after we see something we enthusiastically support, or with which we vehemently disagree. Proper interpretation of this article is also helped by reading other articles that Halstead wrote in his lifetime (as one example, 'Assume the risk and take the blame'. SPUMS 27: 3-1) because doing so helps put the thoughts in this article into context. Halstead clearly believed that divers are responsible for their own safety, and cannot shift that responsibility to another diver.
It wasn't a condemnation of the Buddy System, per se. Rather, it was a reasonable criticism of the misguided assumptions and blind trust, that too many make about, and put into, it. It was a reasonable criticism of the buddy system that is the unfortunate reality in diving today, but NOT a criticism of the ideal. The buddy system does not make an unsafe diver safe. Two half divers do not make a whole diver. When competent, skilled divers go into the water as buddies, it is a good system. Otherwise, it is false security. To quote Halstead: a buddy dive is a 'situation that occurs when two divers of similar interests and equal experience and ability share a dive, continuously monitoring each other throughout entry, the dive, and the exit, and remaining within such distance that they could render immediate assistance to each other if required'. He goes on to say that such a situation is quite often NOT the case.
The 'bottom line' is clearly stated in the summary paragraphs at the end of the article. It is one that I wholeheartedly endorse: EVERY diver should develop their skill to the point that they are capable, and self-sufficient. Only then, should they 'share their dive with another independent diver that they trust'.
It is pointless to obscure the message of Halstead's article by quibbling over semantics. It is disingenuous to assert personal beliefs about the buddy system, or solo diving, as 'FACT' when no data exist to support those assertions. Rather, in the context of the intent of this forum - discussion of the techniques and strategies involved in Solo Diving (the title of the subforum) - it is most appropriate to ask, 'How do I become a capable, self-sufficient diver?'