Just for the record: Arch does have testing and staging repositories for testing new versions of packages that may cause major breakage if they have bugs or packaging problems.

AFAIK new versions of glibc, other major libraries, systemd, Linux kernels, etc. are always kept in one of these testing repositories for a while to catch serious problems.

To help make Arch better, consider running one or more systems on [testing] (a chroot or VM will do) and reporting any problems you find.