But I still appreciate KDE-based Linux environments for their more straightforward, consistent, no-nonsense GUI, which seems to be derived from classic (pre Windows 8) Windows. Another thing that KDE seems to have gotten right is realizing that what makes macOS and Windows useful isn't just the GUI itself but the set of apps that use it and interoperate seamlessly with each other.
Ubuntu seems to have more UI churn than I'd like (even though I prefer Mac-style menu bars, etc.) And Wayland (which KDE has also moved to for better or for worse) has never brought me happiness.
I understand the motivation for Snaps, but I only want them for app store type apps, not for everything.
EDIT: for stupid downvoters - Kubuntu is an official Ubuntu variant. It is officially part of the Ubuntu project. https://kubuntu.org
I don't like the fact that you can't surface the menu with standard cua keyboard shortcuts in dolphin, e.g. alt-v for view. As someone previously using windows this is a step backwards for efficiency.
I almost never need the menus. I set the view settings globally, applied to all folders.
There are keyboard shortcuts for actions within those menus, like cut/copy/paste. The shortcuts are more configurable than on Windows.
F4 opens a terminal in the current directory
That's all I use 99.99% of the time