I recognize that packages of OpenPKG-CURRENT are sometimes broken on Linux or Solaris, but usually never on FreeBSD?
The primary development platform, where the Package Master On Duty (PMOD) performs his daily tasks, is FreeBSD. Because of time constraints the PMOD after an OpenPKG-CURRENT package upgrade only tests it also on Linux and Solaris if time permits. If time does not permit it, the brokenness is discovered later only. But it is at last discovered before an official OpenPKG release because there are all involved packages tested in depth, of course.