I liked this article. We are, I think, quibbling over the author's terms and conflating person experience with industry practice. Fundamentally you will see the broader landscape of issues inherent in a solution if you understand the concepts underlying the tool than if you only understand the tool's surfaces. I vividly remember a networking problem that a gathering of our brightest technicians could not solve and (almost by chance) a passing physicist interrupted the gathering and said we had a harmonics issue.