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I agree with everything you said except this:
PC-BSD is first to use latest KDE and various technologies that is never used on FreeBSD and can help FreeBSD and KDE FreeBSD projects with testing...
On the contrary! PC-BSD uses only stuff already tested on FreeBSD - e.g updated KDE to 3.5.5 only after it was available in ports. In fact, that's where I would like to see some changes in PC-BSD. For instance, for months now, the xorg team of freebsd has been testing xorg 7.2rcX - and for the past 1 month, it has been working fairly well. PC-BSD could have tried adopting 7.2, then do a number of releases to help test (they specifically ask for testers), but went with 6.9 instead. I understand concerns about stability, but don't claim that PC-BSD helps testing new stuff in FreeBSD. It doesn't. (And there are some areas that it could: HSP's new USB stack, Ariff's work on multimedia, etc.).