> has a deep understanding of a problem (and has likely solved it once already), can churn out code far, far, faster
Is this a bad thing to discourage? Perhaps one way to increase your output as a developer is to narrow your focus (rather than jumping on the latest framework or build system which require constantly re-learning new solutions to the same problem)
No. It's what I encourage people in my team to do all the time. In fact it's something I was also encouraged to do.
The full quote was:
"Become an expert in at least one thing in your job or preferably career, and do it while you have the time" (e.g. when you're junior and expectations are low, or not a manager).
