Plasma is rock solid. Yes, you can break it. And that is called freedom.
If you don’t install 30 third party widgets and themes, you’ll be FINE, while still being able to make it yours.
That is why I always choose KDE Plasma (we’ll see when Cosmic comes).
Encountering sleep/black screen bug is not freedom. The average linux user is shifting, its not longer being used only by teens/tech savvy. People want to get things done.