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Linux is so great you're actually free to remake the entire user space in your image if you want. It's the only kernel that lets you do it, all the others force you to go through C library nonsense, including Windows.
The glibc madness you described is just a convention, kept in place by inertia. You absolutely can trash glibc if you want to. I too have a vision for Linux user space and am working towards realizing it. Nothing will happen unless someone puts the work in.