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sure, but if it's the reader's first introduction to the language (which rwo is positioned as), the reader is in a uniquely bad position to discern justified best practices from arbitrary ones, and truths about the language from opinions about it

learning the language first, then someone's ideas about how it should be written (in this case, as encoded in a replacement standard library with a special module dedicated to making any call to the actual standard library throw a compile error), gives you the requisite context to understand the latter