I don't want to drift from the original post to much, but in my learning of KDE (and it is limited to a few OS) the rolling updates are the ones that have issues the most. If you don't do much with the install it works fine. My current KDE OS is wonderful has had "zero" issues and is based on ARCH (which just happens to be a rolling release). Most issues are due to user lack of knowledge when updating or attempting to tweak.
Hardware is the issue with most of ALL Linux OS issues and lack of support for vendors with driver support. We see it daily on this forum with Zorin.





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