Just giving my two cents:
Personally KDE has been a PITA for the past 1-2 years.
Most issues might be related to using nvidia, however the following issues really struck with me:
- No search results in application launcher - #6 by alkl
- Entire system randomly becomes unstable, windows flicker and sometimes stop responding - #11 by teo8976
- Meta key is no longer bringing up Plasma menu
- KDE Plasma 5.25 focus on the wrong window with Nvidia cards
- Can not set light theme for taskbar and drop down shell
- Number of concurrent streams error when installing themes
- Ark 7zip and zip compression not working properly and crashing Dolphin
Don’t get me wrong, most problems have been fixed over the last 1-2years, however the general tendency to ship “”“stable”“” software (on the side of KDE) has been a nerve racking ride.
The main problem I see are the amount of really weird inconsistent behavior across the board - some people might have no issue at all with 5.24, whereas 5.24 was painful for me. I liked 5.25 more than 5.24 - however lot’s of people had more issues.
There are still some fundamental broken / buggy thinks like putting monitors to sleep and glitching windows / (minor) visual bugs.
My personal KDE experience the entire time was to find workarounds for newly added bugs with each release.