The technical environment is constantly changing. The value of this article to the Slashdot community lies in the variety of perspectives and unfamiliar solutions suggested by the respondents. You may be a master today, but in 2 years your knowledge will be obsolete. It still works, your old solution, but until you get clued by another Ask Slashdot, you don't even know that it is now the wrong answer. Not only do answers change, but the questions themselves change. Often merely parametric, at some point the change becomes a phase change, which changes the way things are done, the kinds of things that are done, and how these things affect people's lives.
The perspective of years of experience coping with technical change and complexity is very different from the perspective of new mastery. I design systems to be maintainable and supportable. I also design my own mental processes to be maintainable and supportable over the long haul. Part of that involves mundane, quotidian exercises in fundamentals review.