I have been using KDE since version 2.1, but recently, I have become dissatisfied.
With every update, something new breaks. More and more features that users could previously customize through themes are now hardcoded. For example, the Application Launcher and Task Manager have fixed colors and rounded corners that cannot be disabled.
There is no functional resource manager anymore; the screenshot tool can only capture from the first screen and causes excessive screen flickering; volume controls are also broken, with a system that compresses what used to be a three-page layout into a single page, and it still does not function correctly.
In the past, it was possible to choose the look and feel, and any effects like screen flashing and blinking could be turned off. However, these options are increasingly hardcoded and I don't thing it in the classical spirit of the KDE.