Wrong, RHEL and other Linux distros contribute fixes that often also effect the current development version of KDE as they do not lag very much behind.
BSD ports tree lacks so far behind that the bug fixes made to them were already done in Linux. And even more, they do not contribute back to KDE, they keep the fixes to themselves.
Thus they are holding KDE (and for that matter, all open-source projects) back. But luckily, GNOME has taken the smart decision to ignore BSD and focus on linux instead. This gave them the choice of implementing linux-specific features which give superior performance and characteristics like udev and systemd.
it's interesting cos the majority of BSD desktop users are gnome users so they be forced to switch to linux which is good.
I also strongly think that all other open-source projects should forget about BSD and should implement feature which require the linux kernel so that would make it hard or impossible to port them to BSD. So BSD with have no apps and thus can die quicker

. If they don't like it, I'll give them a noose.
It should serve them right for holding back linux and at the same time spreading anti-Linux FUD.
