I recently noticed this: https://bugs.gentoo.org/show_bug.cgi?id=502836
imlib2 ebuild can only be stabilized in one round for all arches as KEYWORDS are set in eclass depending on E_STATE="release". That has an important drawback as forces all arches to be done at the same time and, since some are much slower than others, forces all to wait for them. And, as that can depend on even more stabilizations (like it's the case) all that bugs blocking the stabilization need to also be done for *all* arches before. I am not sure if any policy exists for this, but I would forbid to make this due this issue. I would instead move to use KEYWORDS en ebuild as done usually. What do you think?