It is great that Fil-C exists. This is the sort of technique that is very effective for real programs, but that developers are convinced does not work. Existence proofs cut through long circular arguments.
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Most of us sadly cargo cult urban myths and only believe in what is running in front of them like Saint Thomas, as to have any kind of feeling how great some things could be like.
Hence why so many UNIX and C clones, instead of creating something new, to be honest those two guys were also visionaries despite some of the flaws, back in 1970's.