I wonder if anyone implemented loading shared libraries without glibc? It shouldn't be that hard, just need to implement ELF parser and glibc-compatible relocation mechanism.

I don't think nobody has done, that. It is just that vendoring your own OS comes with a lot of work.

I don't really know why people expect to be able to bypass the OS and not have problems. It seems to come from people who think a "Linux OS" only consists of the Linux kernel.