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Doing that occasionally between projects, or regularly on your own time (a.k.a. sharpening your saw) is essential to improving as a programmer

But in the context of programming as a job (which is the topic of the post), if one repeatedly spends hours solving already solved problems simply because "one enjoys it", it's a waste of the team's time.

[using old-fashioned "one" here instead of "you" not to make it personal]

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