gcc has no problem with static linking. glibc can be statically linked (with gcc or clang) except the pluggable parts, which is NSS. How would you reconcile static linking and plugins?
As a result of that good intention glibc must now be compiled into each and every program that wants to allow a customization complicating life for anybody who writes system software in anything but C/C++. I would rather preferred for NSS to never happen and instead Linux defined a set of services available over unix sockets for things like DNS resolution or user/group databases.
