Last time gwenviev and kipi stuff broke, krita broke and some other stuff.
Krita did not emerge because of some changed symbols, so I had to reemerge
koffice-libs - something revdep-rebuild did not catch. It catches changed
versions, but if a lib is recompiled because of an -r update and there are
symbol problems, revdep will not see them...
I had to rebuild kdepim and a lot of other stuff, just because of that -D
update. It sucks to have to revdep-rebuild a douzend packages. It suckes even
more when half of them fail because of some symbols and you have to reemerge
three or four additional libs, so you can't just let it run unattended...
In my years of gentoo, -D always caused problems and was almost never worth
the trouble.