FreeBSD actively removed Xorg as one of the base sets. This means we are even further from a default desktop now than we were in FreeBSD 6.x(?).OpenBSD is able to maintain their own damn Xorg stack ffs, there is no excuse given funds and community presence.
Not only would we need to reinstate Xorg back in base but then we would need to greatly strip down KDE to make it suitable for base (and remove unsuitable licenses).
It is a lot of work for little reward compared to
pkg install xorg kde5