I believe the maintainer of the Fedora KDE spin actually commented on this on reddit some months back. Basically KDE unlike GNOME is a packaging nightmare. Too

I believe the maintainer of the Fedora KDE spin actually commented on this on reddit some months back. Basically KDE unlike GNOME is a packaging nightmare. Too many packages with a few having lots of deps. On top of that the release schedule has zero alignment to any non rolling release (and multiple since all package can be grouped in 3 differents suites with their own schedule) which usually ends up have outdated KDE. Infact the best KDE experience is tumbleweed or arch which are both rolling releases. GNOME has no such issue. I belive KDE is adjusting the release schedule to try to solve this(I think they will switching to a 6 month schedule after plasma 6)