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I feel this comment is misguided. Plenty of new code is written in C, particularly in the scientific computing space. If the code in question doesnt do lots memory management and expects the user to provide a memory block to be populated with values, then I see no issues. C code tends to be faster than other implementations even without optimizations. Moreover, lots of interpreted languages have good interoperability with C so a C compiled code can be called in many languages using simple high level interfaces.