At least for a time, many of the big distributions focused exclusively on Gnome, and for KDE users it was kind of frustrating as everything would be all wired up for Gnome, and either KDE wasn’t packaged at all and you had to go third party, or it was a clearly second class citizen where the packagers just didn’t bother to wire up equivalent features. You would look it up and see how KDE had the same capability implemented, but the packager just hadn’t included some dependency or configured something to manifest it.

Now I feel like the distributions take Plasma more seriously and so it’s easier to just ignore whatever Gnome is doing… Except for the occasional horrible UI presented by a Gnome app in your otherwise credible desktop. Since Gnome is both a DE and a UI framework, the UI framework gets to rear its head even if you largely ignore the DE.

Then of course you have the tiling window managers/compositors, but those projects tend to be less ambitious anyway, and what the audience wants is pretty much what they can get from packages, even if the packagers aren’t quite as invested to know what can be done.