I hope within a few years time portmaster and portupgrade fully support all pkgdb , -P -PP flags like they once did. Even that someone could re-write and re-import the older expired portmanager port... for instance
[can > used to ] be crafted, with portmaster instead, to exclude upgrading a port, by package, that brings in a slew of qt4-5 dependencies. And pkg upgrade may eventually include a flag to show which of the list it produces brings in new dependencies, and which ones.