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But there's also no reason why the most widely used HTTP fetcher in embedded software should be the same piece of software as the most widely used command line HTTP fetcher on workstations and servers, most of which do not care much about shaving kilobytes.

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And no reason that the most widely deployed kernel in embedded and server worlds should be the same. But it is, and written in C. Its called GNU/Linux.

Not taking a side on the whole Linux vs. GNU/Linux thing, but the kernel is decidedly not called GNU/Linux; it's just Linux.

This is in fact a strong argument against your hard-line "every kilobyte matters" stance above. Linux is not a particularly small kernel. If code size in the embedded world were really as paramount as you claim, we'd see a lot less Linux and a lot more random RTOSes.

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