I always interpreted that as a factor of the Plasma team being willing to offer compatibility for things that broke the freedesktop spec.
Whereas Gnome / Mutter for example appear to believe that if they don’t strictly follow spec it’ll perpetuate the fragmentation.
I tend to side with the latter perspective but use KDE + kwin on my desktop for gaming for Wayland + vrr (it’s amazing how smooth and responsive this is). Gnome really shines on the notebook form factor so I use it there.