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I was born into a weak and untalented body, so in order for me to do anything, I have to do it as perfectly as I can, just so it comes out okay. One consequence of this situation is that I am annoyed by people doing half-assed work. If I can do whatever I try to do as well as I can, why can't everyone?
Besides, isn't it a lot of extra work to be continually calibrating how well you're going to do something? How well and how sloppily are you going to build that railing or write that report or set up that CSS?
Isn't it just mentally easier just to do everything as well as you can?