Mastery to me means cccuracy combined with speed. It is not enough to be very good at something if you work very slowly and inefficiently. Mastery comes when you perform with precision and quickness. This takes focus, skill, and a lot of practice to hone your craft. To doing the thing expertly and fast.
this territory is moderated
I think it depends on the particular work, and the importance of speed varies from work to work. Some work just need to be completed and done, while others need to be completed with quality. Often times, more time spent on the work could improve quality, and might be worthwhile sacrificing speed for the quality. I think the need for speed is a nuanced discussion and really varies from case to case.
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