I've found in my experience that (many, not all) self-proclaimed "experts" do tend to grossly overestimate the capabilities and competence, and will impede those who are more capable than them for fear that they will diminish the value of their "expert" status. I feel this article is correct in stating that the appropriate way to approach a problem is from the perspective of an amateur, as amateurs typically have little fear of abiding by rules that have congealed within the minds of the "experts", and are more willing to take the chance of being wrong when success is imminent.

As they say, "an expert is someone who has made the greatest possible number of mistakes in their field."