I hear what you're saying Ian and agree.
Firstly, may I correct your quotation from Nick's article. You have paraphrased a little, so the whole of the sentence can be interpreted slightly differently. Nick was talking about advice received on internet forums.
I quote from the article:
"....However (and this is a big however), beware those who appear to know a great deal, but either take shortcuts, operate at the high risk end of the spectrum or are simply cowboys. I soon learned who to trust"
We have all seen posts on all forums where the advice given could be seen by an experienced technician as being both wrong and carry a high risk. I know that, most of us know that, but an inexperienced newbie doesn't. I would call this sort of advice given as being that of a "cowboy"
It is quite rare, in my experience, for a newbie to be forthcoming with the sort of advice that would brand them a cowboy. They tend to be asking the questions and absorbing information rather than give it out.
How do we define a cowboy? Inexperienced? Untrained? Unwilling to accept sound advice? Someone out to make fast £££'s regardless of the consequences?
An inexperienced technician is just that. He/she would only become a cowboy if he had little regard for the consequences of his actions and didn't make any efforts to improve his knowledge or skills.
This is a fascinating topic you've raised Ian, and could go on forever with people raising examples and views in so many areas of our working lives.
Safe and happy cleaning
Ken