From my POV, John was a mechanic. The other hunters he knew probably worked with their hands, too Working class, rather than intellectual, or professional, such as doctors, accountants, lawyers. Intellectuals and professionals are at a remove from the working class, and it's most often the working class who are preyed on, by society (in the way of not having access to the same quality of medical care or educational opportunities, for example) and in the show, by the supernatural.
Granted, some of the cases have involved professional people and institutions of higher learning. But the urban legends which were the heart of where the show started are blue-collar all the way. For me, this season has been a change of focus, or a change of direction. And I'm not saying that's necessarily bad. I'm just saying it's change. And it takes me, personally, time and effort to adapt to change.