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Answered in the very first sentence of the article

> Seeing a program you wrote running directly on the bare metal is deeply satisfying to anyone who enjoys writing software.

This is it. I have been on this site for over a decade now and most the obscure stuff is popular here because it satisfies this criteria for some people. Its actually different for different people. For some its bare metal programming, for some its obscure languages like K, and for even others its some libraries.

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