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You can tell he's kind of mad about it (particularly see the following page here). I find this a bit odd. In many of the more mundane cases he cites (e.g. handwriting) it probably is sensible to reach some threshold and just stay there!
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You could call the constant care required to improve a basic work ethic, with low-key anger being the expected response to people who haven't got one.
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eg: I'm quite a fast typist. I haven't worked proactively on typing speed for 15+ years. I'm pretty sure that typing faster would not help me. I think that recognizing this, and choosing to not improve (and so to focus on other skills instead), is a good.
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