Switched to KDE after many, many years of tiling wms. Bspwm, awesomewm, i3, Hyprland. A few months back I was done with tiling as I found it got in the way more than it was useful for me and often caused issues with games, window placement and other stuff. Installed KDE. Apart from one or two minor bugs, everything just works and works well. I am really impressed.
I gave KDE a serious go again recently but it has some really annoying bugs on multi (3) display systems that affect me but probably not the grand majority of KDE users. Reported the issue, debugged it extensively, pinpointed the exact problem in the bug report and how to reproduce it (found out it also happened on dual screen setups). Then nothing happened. Ticket went quiet and it has been several months now.
I also had plenty of crashes in KDE apps.
I completely get the volunteer basis that KDE builds on, and I am not complaining that my issues do not get fixed. I understand it is being mostly built and maintained by people in their spare time and my issues are probably low priority. But for me personally it is stuff like this that makes KDE unusable as a daily driver.