Some thoughts after reading the thread: I would have thought porters would be following the buildd/piuparts/CI pages for their port (where available) and thus would not need to be notified about arch-specific FTBFS or testing issues. If porters are relying on package maintainers or some automation to notify them instead of being pro-active about builds and testing, that isn't going to produce a high-quality port.
There is a tool for checking uninstallable and out of date packages already: https://qa.debian.org/dose/ -- bye, pabs https://wiki.debian.org/PaulWise
