Me too. I think there is a lot of deep thought in KDE, but it's too open to customization. I don't mean settings, I mean visual changes, and that leads to it looking like an unpleasant jumbly mess out of the box, and I'm skeptical that further customization will make that better. And they got a lot of important consistency things wrong that Gnome mostly addresses, like selectable text (almost) everywhere.
Linux desktops in general horribly suffer from constantly reproducing desktops from a moment in the 1990s, where you have an anime background and some bright text on a dark background and you post it and everyone goes "ooh" and "ahhh" and "how did you do that." One glaring sign of this is design is called "art" rather than design. And you have a kind of mostly compatible Office suite (like a dog chasing after a car), one month you can do awesome actions in the file manager or have a live background but next month that's broken, and every month a new music player, as if any majority of people use local music and documents anymore. What an embarassing waste of time.
It's sad because great ideas abound, like KDE's semantic desktop (which is basically a decentralized version of what Microsoft is building toward), Unity's 3d desktop (which failed when all that neato stuff meant nothing), scriptable desktops, distributed desktops, all kinds of glorious ideas. However it turns out the infinite monkeys creating desktops get distracted easily.
They should start by deeply adopting ideas like design tokens. Here's another idea: give every widget and pane a unique identifer with version, and link them to the web using Linked Data, so at least the world of confusion support forums could feature some coherence, you could embed support in the widgets themselves. That would be a 2022 desktop.