> Why? Have people managed to break the ancient concept of shared libraries

If you break or remove a shared lib here, you may no longer be able to compile something from source. I had that happen in the past before I started to use more statically compiled programs (and busybox too).

Assuming everything works as-is via shared libraries at all times, makes little sense for ALL linux systems. For instance, some people upgrade glibc manually. Then you need a working base system to resume compilation. I do that for my customized gobolinux system, so I can use any program version as well as any glibc version (assuming I can still compile the program; many older programs no longer compile).