As a developer, I disagree.
KDE's interface is often broken and/or unintuitive for what I want to do. At least it usually provides the levers if they're hard to use or find.
Gnome's interface is almost always too simplified and doesn't present the powerful levers at all unless you go digging behind the scenes and hope that an update doesn't break some "private" implementation detail.
I'm not so sure that we're saying different things. I didn't mean it as a compliment, more as an explanation. In general developers aren't good at designing UX (not their job), and in general developers are used to often byzantine UX, including falling back to terminal rituals, and both UI's feel (to me) like they're 80% of the way there and left that way because of the tacit understanding that there's always the terminal and text configs.
https://kde.org/announcements/plasma/5/5.21.0/
If anyone want to try the latest KDE Plasma, KDE Neon has it on top of a stable Ubuntu LTS base.
But then again, it's Linux, I'm a developer, I'm used to Googling how to do things, and I play my video games on Windows, so 90%+ of my time in Linux is in the terminal, text editor (or IDE), and browser anyway. So no complaints - the presence of a fully featured UI isn't why I use Linux.