I want to like KDE, but it's just too unreliable for me. My last foray was about a year or two ago, I had to stop using it because an update something in KDE's power management broke and my laptop no longer reliably suspended when the battery was low (manually triggered suspends still worked fine.) I've been repeatedly having experiences like this with KDE, each time I fall back on LXQt with kwin and everything looks a bit uglier but just simply works.

I don't know what's going on in KDE, but I assume they've got too many software architects with their heads in the clouds, designing a byzantine mess of abstraction and indirection until even they lose track of where in the code the functionality actually lives. That's all just my assumption though, all I really know is that basic features keep breaking between releases.