It looks like a stupid question from the longtime slacker, but I've found one basic important issue not enough clear to me:
May updated packages from patches/packages
introduce new dependencies by a definition ? I'm speaking about packages included in a release not those additionally thrawed in.
It's very important for install/cron-upgrade and forget kinds of boxes like routers. To be sure there won't arise any new unresolved dependencies after upgrades.
Just to make clear if I was lucky nothing got broken up until now