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Actually the entire point of professional education and training, then certification for roles such as those you cite is that they must have an understanding of their tools and the principles behind their use. They are also intended to keep that understanding up to date throughout their careers and the continuing education requirements of licensing support that.

The difference between a repairman and a mechanic, in classical terms, is that a repairmen fixes things with tools someone else made, and a mechanic can make tools. They must understand how machines and tools work, and a doctor (of medicine, a physician) is supposed to have general knowledge of the functions of the body, of the diseases and ailments that effects, and the technology currently available to try to help.

In the Django example up thread (or typical newbie Rails app, etc) an "app" is quickly spawned that the dev may not how to secure, update to new requirements, internationalize, or make perform fast enough to useful.

Somewhere in these mixed metaphors is a discussion about the difference between programming, computer science, and software engineering ..