I currently use niri but Plasma has always been my go-to/backup DE. I always have it installed in case someone else has to use my PC.
One of the tricks Debian team does is they first compile the old KDE with newer libraries, then migrate KDE itself, like Intel's Tick Tock. This gives both a performant and issue-free experience as far as I can tell.
Note: I run Debian Testing on my Desktop systems. Servers always run stable.
Don’t get me wrong, KDE is a nice desktop in many ways, but it would benefit considerably from attention of a professional UI designer.
I know, of course, that it's an extremely minor thing, but it felt quite representative. It also reminded me that Linux is stuck in this bygone age where it's expected for a computer to be a multi-user system, so of course they can't have a "privileged" user account other than root (and god forbid you'd think of using root as your normal every day user).