As mentioned in the blog, almost all GNOME developers use a systemd distribution. How would adding another layer in between make things less buggy? Especially as almost nobody would test that code?
GNOME will release 3.10.0. Gentoo seems to be integrating 3.8. That's a difference of 6 months! Way too late to do anything about bugs.
GNOME 3.8 has been available on Gentoo in various forms since April - first in the gnome overlay, then hardmasked in the portage tree, then unmasked into unstable/testing ie. ~arch. The (one month old) gentoo-dev thread that the blog author referred to is talking about the stabilization of GNOME 3.8, which is the tier used by the most conservative users who have chosen to only use well-tested software that is known to build/run well on their architecture and has received ample testing. This is not very different from binary distributions, Ubuntu 13.04 shipped on April 2013 with GNOME 3.6 from Sep 2012.
GNOME will release 3.10.0. Gentoo seems to be integrating 3.8. That's a difference of 6 months! Way too late to do anything about bugs.