Comment by jraph

Early versions of KDE 4.0 were terrible, and it lasted for a couple of years, but I've found later versions quite solid. Early versions of KDE 5 were relatively stable but were lacking features. I find late 5.X versions and all 6.X version quite robust.

There are still bugs but they do seem to be ironing them out, they go in the right direction.

The only big bugs I notice these days are the occasionnal plasmashell crashes but it comes back on its own. KWin doesn't crash and that's fortunate because on Wayland, that would bring down non KDE apps.

I exclusively use plasma, I'm quite sensitive to instabilities, it's not an issue for me with KDE.

I did avoid the first years of KDE 4 and was using GNOME at that time.

Have you tried Trinity?